Demetrius of Montferrat

Demetrius of Montferrat (1205–1230) was king of Thessalonica from 1207. Born in the city and named after its patron Saint Demetrius, he was the son of Marquis Boniface I of Montferrat and Margaret of Hungary. After his father fell fighting the Bulgarians, Latin Emperor Henry of Flanders overawed the Lombard barons and crowned the boy king on 6 January 1209.

When Theodore of Epirus took Thessalonica in 1224, Demetrius fled to Frederick II, joined his crusade, ceded him his claims to the kingdom and died at Amalfi in 1230.