According to this tradition, the Anguissolas are descended from the Constantinopolitan warlord Galvano Sordo or Galvano de Soardi/Sourdi (Σούρδη, a family name still in use today in Greece, Constantinople and Smyrna). In 717, Galvano served in the army of the Byzantine emperor Leo III the Isaurian, and "with an ingenious artificial fire, contributed to liberate the city of Constantinople from the Saracens who had kept it besieged by land and sea”. This “artificial fire” was the so-called Greek fire, an incendiary weapon developed in the late 7th century, which was responsible for many key Byzantine military victories, most notably the salvation of Constantinople from two Arab sieges, thus securing the Empire's survival.