HMS Eurylas (named for one of the Argonauts) was a 36 gun Apollo-class frigate which was launched from Bucklers Hard in 1803 and saw service at Trafalgar and the War of 1812. She continued in active service until 1825, served as a prison hulk, and was broken up in Gibralter in 1860.
Vice Admiral Sir Henry Blackwood, 1st Baronet, GCH, KCB (28 December 1770 – 17 December 1832) was appointed to command HMS Eurylas, and in July 1805 was sent to watch the movements of the enemy fleet under Villeneuve. On his return with the news that Villeneuve had gone to Cadiz, he stopped on his way to London to see Nelson, who went with him to the Admiralty, and received his final instructions to resume the command of the fleet without delay. Blackwood, in the Euryalus, accompanied him to Cadiz, and was appointed to command the inshore squadron, and to keep the admiral informed of every movement of the enemy, but hoped to be ordered into a vacant line-of-battle ship. He was signalled to do so at six o'clock. Nelson gave him the the command of all the frigates, for the purpose of assisting disabled ships, but he also gave authority to use his name in ordering any of the stern-most line-of-battle ships to do what struck him as best. Immediately after the battle Collingwood hoisted his flag on board the Euryalus, but after ten days removed it to the Queen, and the Euryalus was sent home with despatches and the captured French admiral, Pierre-Charles de Villeneuve. Blackwood landed at Falmouth and was one of the first messengers to use the Trafalgar Way to deliver his dispatches to the Admiralty in London. He was thus in England at the time of Lord Nelson's funeral (8 January 1806), on which occasion he acted as train-bearer of the chief mourner, Sir Peter Parker, the aged admiral of the fleet.