sentences:  It is unknown if Leo was the head of the Arab fleet defeated by Himerios on St. Thomas' Day (6 October, probably in 906), but along with Damian of Tarsus he was in command of the Arab fleet that scored a major victory over Himerios in April 912 off Chios, while he was returning from a fruitless attempt to reconquer the Emirate of Crete.Finally, in 921/2, the imperial navy under the "patrikios" and "droungarios" John Rhadenos defeated Leo's fleet off Lemnos.Most of the Arab fleet was destroyed and Leo himself barely escaped.