Boniface II (July 1202 – 12 June 1253), called the Giant, was the eleventh Marquis of Montferrat from 1225 until his death. He became the titular King of Thessalonica in 1239. Boniface was the eldest child but only son of the three children of William VI and his second wife, Berta di Clavesana. He was appointed to succeed his father in 1225 when William led a group of crusaders to Frankish Greece. In Spring 1226, he took full command of Montferrat.