Sir Philip Charles Henderson Calderwood (1763-1845), was the third son of James Durham and his wife Ann, daughter and heir of Thomas Calderwood. He entered the navy in 1777 on the Trident, later being appointed acting lieutenant of the Victory, the ship which later saved him after the sinking of the Royal George.
In 1799, he married Lady Charlotte Matilda Bruce, the only surviving daughter of the Earl of Elgin, before going to join the Endymion in 1801, moving to the Defiance in 1803. After seeing action off Cape Finisterre the ship was sent home to be refitted but instead was turned around to join Nelson off Cadiz.
Durham continued his rise after Trafalgar, where he was slightly wounded, becoming rear-admiral in 1810, being nominated a KCB in 1815 and a vice admiral in 1819. He later entered politics as the MP for Queensborough from 1830.