HMS Thais was built for the British Royal Navy in 1806 and was the name-vessel of her class of fire ships.

[b] By February 1808 Thais was back at Plymouth and undergoing refitting as a sloop, a process that took into April.

In August Thais was part of a squadron under the command of Sir Home Riggs Popham in the Scheldt during the Walcheren Campaign.

[6] Thais was re-rated as a sixth rate in 1811,[1] and on 3 April Scobell received promotion to post captain.

On 29 August, Thais captured the Portuguese brig Flor d'America, also at Loango, that was carrying 364 slaves.

[14] Then on 28 May 1813 Thais was involved in apprehending Juan a ship sailing near the Rio Pongo, which was then taken to Sierra Leone.

[15] She was an American sloop carrying no slaves; British records indicate that the capture took place off Cape Sierra Leone.

[9] On 27 June Thais and the colonial armed schooner Princess Charlotte captured three small craft off Cape Mesurado.

[f] In late March 1814 Thais was at Hellevoetsluis to transport French coins that Nathan Rothschild had collected.

By the time Thais and Comus were able to deliver to Bordeaux the £450,000 that Rothschild had gathered Napoleon had abdicated.

[19] Between October and December 1814 Thais was at Plymouth being cut down, losing her spar deck, and having her armament being reduced to 16 guns.

[22] Between 6 and 11 April 1816, Weir was president of a court-martial that took place on HMS Cornwallis in Madras roads.

Under his command she arrived at St Helena on 28 September from India, and sailed two days later for England.

[1] The "Principal Officers and Commissioners of His Majesty's Navy" offered "Thais, of 22 guns and 431 tons", lying at Plymouth, for sale on 13 August 1818.