Background
He was born c. 1220. Demetrios was the younger son of Theodore Komnenos Doukas and Maria Petraliphaina. In 1230 his father was captured together with his family in the Battle of Klokotnitsa by Ivan Asen II of Bulgaria.
He was born c. 1220. Demetrios was the younger son of Theodore Komnenos Doukas and Maria Petraliphaina. In 1230 his father was captured together with his family in the Battle of Klokotnitsa by Ivan Asen II of Bulgaria.
When John submitted to Emperor John III Doukas Vatatzes of Nicaea in 1242, Demetrios also received the title of despotes. Young and dissolute, Demetrios inspired little loyalty among the leading families of Thessalonica. When Emperor John III Doukas Vatatzes campaigned near the city during his invasion of Bulgaria in 1246, the local nobility conspired to arrest Demetrios and turn over the city to the Nicaean emperor.
Demetrios was powerless to resist and the city was surrendered to John III Doukas Vatatzes.
Demetrios was sent into exile to the fortress of Lentiana. The date of his death is unknown.
