John Russell, 4th Earl Russell

John Conrad Russell, 4th Earl Russell, styled Viscount Amberley from 1931 to 1970, was the eldest son of the philosopher and mathematician Bertrand Russell and his second wife, Dora Black. His middle name was a tribute to the writer Joseph Conrad, whom his father had long admired. He was the great-grandson of the 19th-century British Whig Prime Minister Lord John Russell. He succeeded to the earldom on the death of his father on 2 February 1970.