[1] From there he worked his way up with the help of the patronage of another relative George Jeffreys until he was appointed a king's counsel by Charles II.

[1] In 1685 he was appointed to the high offices of Master of the Rolls and Speaker of the House of Commons by James II.

[1] Being a Tory and a partisan of James II, the accession of William III saw Trevor deprived of his office.

[3][4] He was accused of taking bribes from the East India Company and the City of London, and was investigated by a committee chaired by the Commissioner of Accounts, Paul Foley MP.

[4] On 7 March 1695, he was found guilty of accepting a bribe of 1,000 guineas from the City of London Corporation to aid the passage of a bill (for the relief of orphans) through the house.