A reassessment of a well-known wreck site
The site known as the Douro has been charted since 1980 in the vicinity of the Round Rock of Crebawethan to the south-west of the Scillonian archipelago after having been discovered in the late 1960s. The site assemblage consists principally of manillas, a form of brass currency, and blue and white glass aggry beads, both known to have been consigned for west Africa. Knives have also been recovered. There has also historically been reference made to ‘a lot of pistol side plates’ and ‘hundreds of brass keyholes’ which have added an air of mystery to this wreck. [1]

Shared under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) licence.
The Charming Kitty of 1763 in Historic England’s marine records, wrecked at Howick, Northumberland, provides a useful comparator. She was bound from Hamburg to Africa, having been captured on route from St. Kitts for Senegal by a Moroccan xebec, and sent for Saffi on the Barbary Coast (now Morocco), whence the English crew were taken up by Danish and Dutch merchants. The vessel was then sent to Hamburg, presumably as part of the price of the other Europeans’ ransoming of the English crew and vessel, and was on her way therefrom when wrecked. (This in turn suggests she was significantly off course and driven north-west by a south-easterly wind.)
No armament parts are recorded, but an advertisement for the cargo reveals ‘bugle’ or trade beads, knives and padlocks [2], and these were among goods typically used as exchange cargoes for slaves.
The site was first identified as the Douro in 1971 [3] with an unsourced reference to its cargo of ‘armoury and brass stops” which has never been traced, which has further deepened the mystery over this wreck.
The Sunderland-registered Douro was built in 1839, and, as her name implies, she appears generally to have been a regular trader to Oporto and a specialist in the city’s eponymous port wine. Things changed in late 1842 with two Anglo-Portuguese treaties in late 1842, the one a commercial treaty and the other a treaty ‘for the suppression of the slave trade’, both subject to protracted negotations. ‘By the treaty relative to the slave trade, Portugal undertook to punish her own delinquent vessels’, demonstrating that there remained some Portuguese involvement in the trade, despite abolition there in 1836. The debates over the negotiations and the tariffs imposed by Portugal were known as the ‘Douro question’. [4]

ZBA1548 National Maritime Museum, Greenwich, London
So what on earth was a British vessel doing with manillas and aggry beads and other cargoes known to have been used in the purchase of slaves, when abolition had taken place in England in 1807 and in Portugal in the more recent past? Curiouser and curiouser – what was she doing, and was she involved in clandestine trade to Portugal’s former colony Brazil, which would not completely abolish slavery until 1888?
We know that the Douro left Liverpool on 18 January 1843 for Oporto. Was she then going onwards illegally (in both Britain and Portugal) to Africa?
On the night of 26 January 1843, the Douro ran ashore among the Western Rocks, Isles of Scilly, the site known as the Douro located by the Round Rock of Crebawethan. She was seen by fishermen the following morning dismasted and thrown onto her broadside ‘with the sea making a complete breach over her’, which suggests some roughness to the sea, and no one was found, which suggests likewise. It seems that the loss was due less to a storm, even in rough seas, than to ‘thick weather’. During the course of the morning the vessel ‘bumped so heavily upon the rocks that she soon went to pieces and part of the cargo came ashore. [5]

That cargo was reported as ‘Manchester goods’ and ‘bale goods’ specified as cotton twist and printed fabrics, a cargo consistent with a Liverpool departure, and possibly at least one other vessel was lost among the Western Rocks of the Isles of Scilly that night. [6]
Was the reported cargo a cover for the illicit cargo? Did the manillas sink with the vessel while the fabrics floated away?
There is also a discrepancy in the contemporary reports for the Douro‘s loss with the site’s known position. She is consistently reported as having bumped over ‘rocks’ in the plural, and the cargo seen ‘on the rocks’, whereas the Round Rock of Crebawethan is a single large rock, not a grouping. At no time was the Round Rock specified in any contemporary reports, and the ship was reported by local boats, which implies strong local knowledge and clarity on the location. Similarly, no one reported any of the cargo that characterises the known site. This wreck becomes more and more problematic the more we look at it.
The vessel’s logbook was discovered shortly afterwards, entering her cargo, and she had ‘cleared out’ from Liverpool, indicating that she had passed Customs outbound. This would suggest that her cargo was entirely legitimate and active patrols by British ships against the slave trade would have meant that a clandestine cargo was a significant political risk. It is true that Manchester and Lancashire cotton textiles were intertwined with the slave trade, the raw materials being sourced from slave labour in the Americas and exported as textiles as an exchange cargo for people.
However, textiles were legitimately exported worldwide, including West Africa. Both textiles and manillas tapped into the existing networks established by the slave trade, repurposed for palm oil instead, and both continued to be sent to Africa post-abolition, the one as a cargo for sale, the other as a currency, both in exchange for palm oil. Other wrecks are known from this post-abolition trade, for example, the brig Hope, also among the Isles of Scilly, while bound from Ghana for London in 1830. [7]
It therefore seems unlikely on location and cargo grounds that the vessel at this site is actually the Douro. The ‘armoury and brass stops’ reference remains untraced and it appears both obscure and archaic for an 1843 cargo. It cannot be made to fit the assemblage at the site and neither works as a description for the manillas, to which they have historically been assumed to refer. Until the reference is properly sourced, ‘armoury and brass stops’ must be regarded as a red herring which sheds no light either on the site itself or on the Douro. In summary, the documentary record for the Douro corresponds poorly with the artefact evidence and raises more questions than it answers.
Only one other vessel has historically been reported as having been lost at the Round Rock, Crebawethan, the English fishing lugger Cornish Girl, in 1873, which, from the nature of its trade, can be excluded as the source of the manillas. Seven other vessels have been recorded in the wider Crebawethan area, but none are a good fit and can be readily excluded.
It is clear that in any scenario pre- or post-abolition the vessel concerned was travelling to Africa: all the clues among the cargo – the manillas, the aggry beads, and the gun plates – all point to a West African destination. While characteristic of the late 17th and 18th century slave trade, such cargoes also persisted into the post-abolition and colonial eras: post-abolition, beads were exported to Africa, as demonstrated by those sold from the Juno, bound from London for Senegal, in 1812. [8]
The cargo in itself suggests that the vessel was wrecked outward-bound, and it appears to be in an easily accessible and choherent assemblage, rather than a scattered debris trail, so that it seems most likely that the wreck event was one of rapid sinking in a ‘straight down’ event, following the initial shock of contact with a feature such as a rock – not bumping several times over more than one rock, as was recorded with the Douro. Therefore, the Douro does not fit in manner of loss either.
The mystery deepens. Who or what was the ship wrecked at the site known as the Douro?
A good candidate emerges in the loss of the barque Custos, of and from Liverpool for Bonny in Nigeria with a general cargo. On 28 August 1856, she struck on a rock in a location variously described in contemporary accounts as the (less specific) Western Rocks, or the more specific Crim Rocks, Crim Rock, and the Crim Reef., not very far from Crebawethan. [9]
She ‘very soon became a total wreck. The master and crew – 17 in number – took to a boat, and were safely landed, having saved very little beyond what they were wearing at the time of the vessel striking the rocks’ [10]
Variations in recording the location of loss in contemporary accounts regularly occur, while it is not at all uncommon for a wreck site, when found and identified, to lie some distance from the reported location of loss, or from where she initially struck – even where a very specific feature is reported, such as the Crim Rocks. In this case the distance between the Crim and the Round Rock of Crebawethan is 1.75 miles.
The crew survived and took to their boats, apparently landing by their own efforts (rather than local boats attending the wreck, as in the case of the Douro, or picked up at sea by another vessel). It seems probable, therefore, that the initial report of the location came from the wrecked crew, therefore, not from locals. Nor does the advertisement for sale of the salvaged cargo state where it came from other than the vague ‘here’, representing the Isles of Scilly.
In that respect it may be significant that the least specific location, the Western Rocks, comes from the most local paper, and the more specific ones, in terms of naming the location as the Crim, from the national or London press. This suggests that the position of loss as reported by the crew is the one which most probably was reported to Lloyd’s agent, and is thus the version which made its way into the national press.
In other respects, the regional newspaper contains the longest and fullest account and thus, as was usual with local wreck reports, has been synthesised from more than one source. It was published later than the other accounts, on 5 September 1856, and is therefore based partly on observation in the days following the wreck. It draws attention to the salved cargo and suggests that ‘Western Rocks’ is based on observation of the dispersal of wreckage locally; it also suggests that by that time the vessel had disappeared from view even in potentially less than 10m of water as she ‘very soon became a total wreck’. The wreck account for the Douro demonstrates how quickly this could happen.
The Custos‘ salvaged cargo included the following:
‘ . . . 31 pipes and 55 Quarter casks Rum; 25 Bales of Cotton Goods; 49 small boxes soap; 191 Muskets; 2 casks Gun flint; 136 Barrels of Gunpowder; 4 Bags of Manillas; 2 Cases of Matches; and a lot of Staves and Sundries . . . ‘ [11]
Similarly, the bulk of the salved cargo appears to be goods which would have easily floated or potentially been accessible in on a ship resting in the upper holds at less than 10m as charted: barrel (rum, gunpowder), bale (cotton) and case goods (matches), and soap, but a limited quantity of heavier goods, such as the muskets and manillas, were also saved.
The heavier salved goods may therefore represent remains from any portion of the vessel still upon the rock.
The contemporary records of the salvaged cargo are consistent with the African trade even in the post-abolition era and is also consistent with observations on site, namely the muskets, whose ‘pistol plates’ survive, and the manillas.
Further, the reference to manillas is the sole instance so far recorded among the wrecks in Historic England’s database of a contemporary reference to a manilla cargo, and thus the only vessel to be explicitly recorded with a cargo of manillas, This in itself is not necessarily conclusive, but, in tandem with being recorded in contemporary sources as less than 2 miles away, likewise on the seaward side of the Isles of Scilly, is another piece of circumstantial evidence that the wreck is not the Douro, but the Custos, particularly given the security of the evidence that manillas were associated with the wreck (contemporary salvage).
The lack of physical vessel remains is consistent with both the site environment (rocky gullies) and the reported rapidity of the Custos’ loss, and the loss event is interpretable as characteristic of a loss to a single rock at the site where it lies, rather than reef or group of rocks, which seems to have been the case with the Douro.
The rapid sinking is also consistent with the predicted ‘straight down’ loss event legible in the easy accessible and coherent assemblage from which many manillas have been recorded over at least 50 years.
The Douro therefore probably lies at Crim Rocks, which fits the description of the site of loss, and the Custos is the wreck at the Round Rock of Crebawethan, not at Crim Rocks.
The only factor preventing 100% certainty that the vessel is the Custos is the contemporary attribution to the Crim Rock(s), but, as stated above, this difficulty is not insurmountable given the proximity of the Crim Rocks to Crebawethan, and such discrepancies are characteristic of wreck identification processes in any case (see, for example, our blog on the Erard Harp, where the wreck site was some miles distant from the reported location). But, on the balance of probabilities, the likelihood that the wreck is the Custos is very high.

The contemporary attribution may in itself be a clue to the cause of loss – navigational error – particularly as it seems that it might well have originated from the crew themselves, and that they were not properly able to identify the location of loss. For over 150 years their report has misdirected attention away from a plausible identification for the manilla site. At the same time, the Douro was lost in ‘thick weather’, indicating fog, so, again, there would not have been perfect clarity as to the location of loss.
By naming the Custos, all the mysteries have been solved: the Douro‘s name has been cleared: not a vessel engaged in clandestine support of the slave trade but a legitimate specialist in the port wine trade, as she had always been, and the Custos is now the most plausible candidate that explains the presence of manillas in the post-abolition era among the Western Rocks.
It also strikes me that this blog, together with the last two, make a complementary trio and strangely, although this wasn’t intentional, the previous two do hint at this one: the Adgillus, like the Custos, was bound to West Africa from Liverpool, for the Victorian palm oil trade. Like the Dom van Keulen, some of the cargo is in the collection of the British Museum (used to illustrate the blog) and other museums around the UK, and we have made an identification on the balance of probabilities through careful examination of the original sources.
We complete a circle as we identify a long-problematic site.
[Article based on a much longer unpublished report by Serena Cant for Historic England, 2021]
Footnotes
[1] reported from the site in the 1960s
[2] London Evening Post, 5 to 7 January 1765, No.5,655, p2
[3] Larn, R 1971 Cornish Shipwrecks: the Isles of Scilly (Newton Newton Abbott: David & Charles)
[4] See Hansard, House of Lords debate, 2 August 1842, Vol. 65, cc935-6, and 9 August 1852, Vol. 65, cc.1178; press reports e.g. the Dublin Evening Post, 4 February 1843, p2
[5] Morning Post, 03.02.1843, No.22,479, p3
[6] Lloyd’s List, 02.02.1843, No.9,017; Historic England Marine Historic Environment Record entries for the other ships lost that night.
[7] Historic England Marine Historic Environment Record entry for the Hope, 1830
[8] Historic England Marine Historic Environment Record entry for the Juno, 1812
[9] Respectively the Royal Cornwall Gazette 5 September 1856, No.2,775, p5; Lloyd’s List, 1 September 1856; Morning Post, 2 September 1856, No.25,793, p8, and the secondary source Larn R & Larn B 1995 Shipwreck Index of the British Isles, Vol.1: Isles of Scilly, Cornwall, Devon, Dorset (London: Lloyd’s Register of Shipping) which, from internal evidence, has been sourced from a contemporary inquiry into the event, not referenced in that text.
[10] Royal Cornwall Gazette, 5 September 1856, No.2,775, p5






























