 Complete the following phrase:  Nothing is known of his early life. He was named megas domestikos commander-in-chief of the Empire of Nicaea, but sources differ on when and by whom: Nikephoros Gregoras records that this was done by Theodore I Laskaris ruled 12041222, but George Akropolites asserts this was done by Theodore Is successor, John III Doukas Vatatzes r. 12221254 soon after his accession. Modern historians generally consider the latter more probable. In 1224 Andronikos was sent to the region of the Scamander river, 