The early martyr and reputed dragon-slayer was traditionally born to a father from Cappadocia and a mother from Roman Palestine, and closely associated with the town of Lydda (today known as Lod).
He is said to have been martyred under Diocletian in 303 AD, but remains a popular saint in Palestinian Christian tradition, and also venerated by Muslims due to a popular identification with al-Khidr.
Sorry, the dragon story seems to have come along later.
And I guess I should quote Henry V:
I see you stand like greyhounds in the slips,
Straining upon the start. The game's afoot:
Follow your spirit, and upon this charge
Cry 'God for Harry, England, and Saint George!'