William de Vesci or Vescy was a prominent 13th-century noble. He was a son of William de Vesci and his second wife Lady Agnes de Ferrers, daughter of William de Ferrers, 5th Earl of Derby, and his first wife Sibyl Marshal.
Marriage and legacy
He married Isabella, daughter of Adam de Perinton and widow of Robert de Welles. They had issue: • John de Vesci, d. 1295. He married Clemence de Avagour, a kinswoman of Queen Eleanor in 1286. He also fathered an illegitimate son, William de Vescy of Kildare, with Devorgille, daughter of Donal Roe MacCarthy Mór, Prince of Desmond. ==Arms==
Arms
During the lifetime of his brother, John, William bore arms blazoned: Or, a cross Sable, debruised by a label of five points Gules. Upon succeeding John, William bore arms blazoned Or, a cross Sable. These arms were later inherited by his illegitimate son, William. ==References==