Background
He was the fifth son of Sir Ralph Delaval, 1st Baronet and his wife Anne Leslie, daughter of the 1st Earl of Leven.
He was the fifth son of Sir Ralph Delaval, 1st Baronet and his wife Anne Leslie, daughter of the 1st Earl of Leven.
Subsequently he represented Northumberland in the Parliament of England until 1707 and then in the Parliament of Great Britain until 1708.
1st Parliament of Great Britain]
Delaval sat as Member of Parliament (Member of Parliament) for Morpeth from 1701 until 1705.
