 Complete the following phrase:  Pothos and Leo both followed military careers and reached high office. In ca. 921 Pothos was appointed to the post of Domestic of the Schools by Romanos I r. 920944 in succession to Adralestos, who had died recently. A most handsome and experienced man, according to Theophanes Continuatus, he was sent to counter a Bulgarian invasion into Thrace during the 