Ralph Vaughan Williams

... was the third child and younger son of the Rev. Arthur Vaughan Williams and his wife Margaret. Arthur Vaughan Williams was the vicar of Down Ampney, which is a village between Cirencester and Swindon. Margaret was born Margaret Wedgwood; she was the great–granddaughter of Josiah Wedgwood. She was also the niece of Charles Darwin; her mother, Caroline Wedgwood, was Darwin's sister.

Charles Darwin was also descended from Josiah Wedgwood; his mother, Susannah, was Wedgwood's daughter. This means that Ralph Vaughan Williams, as well as being the great–great–grandson of Josiah Wedgwood, was also his great–great–great–nephew.

Wikipedia has a detailed article about this family, including an extensive family tree.

Ralph Vaughan Williams named one of his best–loved tunes after the village of his birth; it's the one to which we sing the words "Come down, O love divine".