 Complete the following phrase:  Born ca. 1297, Demetrios was the youngest of Andronikos IIs sons. In ca. 1304, he was sent to the court of the Serbian ruler Stephen Uroš II Milutin, intended to become his successor; his stay there was short, however, and he soon returned to Constantinople. In 1306 he was named to the highest court rank, that of Despot. In the 