Greek fire
Incendiary mixture based on crude oil (‘naphtha’), which was launched with the help of a pressure pump. Its used was spread in Byzantium towards the late 7th century and became one of the most powerful weapons of the Byzantine navy until the invention of canons.

strategos ("general")
During the Roman period his duties were mainly political. Οffice of the Byzantine state´s provincial administration. At first the title was given to the military and political administrator of the themes, namely of the big geographic and administrative unities of the Byzantine empire. Gradually the title lost its power and, already in the 11th century, strategoi were turned to simple commanders of military units, responsible for the defence of a region.