Background
He was a younger son of Sir Roger Mostyn, 3rd Baronet.
He was a younger son of Sir Roger Mostyn, 3rd Baronet.
Mostyn served as Governor of Minorca for a ten-year period between 1768 and 1778. lieutenant was a titular role and Mostyn was not in residence on the island, which meant that his deputy was in effective charge - from 1774 this was James Murray, his eventual successor who was forced to surrender the island in 1782 to a Spanish force.
11th Parliament of Great Britain. 9th Parliament of Great Britain. 10th Parliament of Great Britain.
12th Parliament of Great Britain.