Thomas Graves was a senior Royal Navy officer who was raised to the Irish peerage as Baron Graves in 1794. The St Budeaux account refers to the person who received the Agaton estate from Alcock only as the late Lord Graves.

The manor source does not give his personal name; the identification is based on the contemporary account's description of the Graves family and the chronology of the peerage.

Research sources:
- Daniel and Samuel Lysons, Magna Britannia, vol. 6, Devonshire, Part II, 1822, account of St Budeaux, p. 88; identification of Lord Graves corroborated by the same work's entry for Baron Graves and by the historical peerage record. — https://upload.wikimedia.org/wikipedia/commons/e/e3/Magna_Britannia%3B_-_being_a_concise_topographical_account_of_all_the_several_counties_of_Great_Britain._%28IA_magnabritanniabe00lyso%29.pdf
- Wikipedia biographical reference — https://en.wikipedia.org/wiki/Thomas_Graves,_1st_Baron_Graves