prisoners to Dumbarton Castle. FitzWarin was later exchanged for Henry St Clair, Baron of Roslin in a prisoner exchange. FitzWarin died some point around 1299. Family William FitzWarin married Maria de Ergadia (d. 1302), daughter of Eóghan of Argyll. She had previously been the wife of Magnús Óláfsson, King of Mann and the Isles (d. 1265), Maol Íosa II, Earl of Strathearn (d. 1271), and Hugh, Lord of Abernethy (d. 1291/2). William is known to have had the following issue: Robert, (died 1297) - Killed during the siege of Urquhart Castle. John, (died c. 1297) William FitzWarin and his wife Maria de Ergadia were buried at Greyfriars, London. References Notes Sources Year of birth missing 13th-century English people Medieval English knights English people of the Wars of Scottish Independence 1299 deaths