Trevor was knighted in 1597, while on military service in Ireland, and, like his younger brothers Sackville Trevor and John Trevor, he enjoyed the patronage of Charles Howard, 1st Earl of Nottingham. He was brought in as MP for Bletchingley to replace Howard when Howard elected to represent Surrey.
Sir Trevor received a knighthood in 1597 while serving in Ireland, and like his younger brothers, he enjoyed the support of Charles Howard, 1st Earl of Nottingham. He was elected to Parliament as MP for Bletchingley, replacing Howard when Howard decided to represent Surrey instead.