Феодор Комнин Дука
When Robert of Courtenay, the newly elected Latin Emperor, was marching from France towards Constantinople in 1221, Ivan Asen accompanied him across Bulgaria. He also supplied the emperor's retinue with food and fodder. The relationship between Bulgaria and the Latin Empire remained peaceful during the reign of Robert. Ivan Asen also made peace with the ruler of Epirus, Theodore Komnenos Doukas, who was one of the principal enemies of the Latin Empire. Theodore's brother, Manuel Doukas, married Ivan Asen's illegitimate daughter, Mary, in 1225. Theodore who regarded himself the lawful successor of the Byzantine emperors was crowned emperor around 1226.