“ Through Queen Adelisa, Petworth came first into the hands of her steward, Reginald de Wyndsor, and was afterwards given to her brother Josceline, who held it of the honour of Arundel. Josceline married Agnes de Percy and assumed the surname of Percy. The honour and manor of Petworth followed the descent of this family until 1708. In 1377 Henry Percy was created earl of Northumberland. The only daughter of the last earl married Charles, duke of Somerset, in 1682, and Petworth descended through their daughter Catherine to the earls of Egremont. ”