Princess Royal first appears in Lloyd's Register with William Forbes, master, John Dawson, owner, and trade Liverpool–Africa.

[3] On all four slave trading voyages that Princess Royal completed, she gathered her captives in the Bight of Biafra and Gulf of Guinea islands.

Princess Royal sailed from Kingston on 22 December and arrived back at Liverpool on 14 February 1791.

Princess Royal sailed from Africa on 21 October and arrived at Havana on 30 December with 444 captives.

Carson sailed from Liverpool on 26 April 1792 and arrived at Kingston, Jamaica, on 1 December with 459 captives.

[6] 4th enslaving voyage (1793–1794): Captain James Brown replaced Carson, and on 16 July 1793 acquired a letter of marque.

[10] Lloyd's List reported on 12 May 1795 that a French squadron had captured Princess Royal, Brown, master, of Liverpool, in the Bonny River.

[11] Lloyd's List reported on 27 October that Princess Royal, Brown, master, was among a number of vessels that a French squadron had captured and taken into Cadiz.