Saint George was a knight and born in Cappadocia. One time he came to the city of Silene in the province of Libya. Near this city was a pond, wherein there was a dragon which was poisoning all the country. Whenever he approached the city he poisoned the people with his breath, and therefore the people of the city gave to him every day two sheep to eat, so that he would do no harm to the people. When they ran out of sheep, he was given a man and a sheep. Then an ordinance was made that the children and young people of the town should be chosen by lottery to feed the dragon. Whoever the lot fell upon, wealthy or poor, he or she was delivered to the dragon……
…….Saint George said to them, "Doubt not. Believe in God and Jesus Christ, and be baptized, and I shall slay the dragon."
Then the king and all his people were baptized, whereupon Saint George killed the dragon and cut off his head. It took four ox-carts to remove his body from the city.
https://www.pitt.edu/~dash/stgeorge1.html