 Around 1262 or 1263 , the Mamluk leader Baibars attempted an attack on Antioch , but the principality was saved by Mongol intervention . In later years the Mongols were not able to offer as much support . In 1264 – 1265 the Mongols were able to attack only the frontier fort of al @-@ Bira . In 1268 Baibars completely overran the rest of Antioch , ending the 170 @-@ year @-@ old principality . 
