William FitzWarin
He was the constable of Urquhart Castle ( 1296-1297 ) and after the English defeat at the Battle of Stirling Bridge on 11 September 1297 , he was appointed constable of Stirling Castle , which he later surrendered and was imprisoned in Dumbarton Castle . 
<triplet> Battle of Stirling Bridge <subj> 11 September 1297 <obj> point in time