Sir Mordaunt Martin, 4th Baronet was son of Sir Roger Martin, 3rd Baronet and Sophia Mordaunt. He inherited his baronetcy from his father, who was the third Martin Baronet, upon his death in 1762. He lived in Burnham Market in Norfolk

Burnham Market is an English village and civil parish near the north coast of Norfolk. It is one of the Burnhams, a group of three adjacent villages that were merged: Burnham Sutton, Burnham Ulph and Burnham Westgate. In 2022, Burnham Market was rated among the "20 most beautiful villages in the UK and Ireland" by Condé Nast Traveler in 2020.