St. Florian was a Roman officer stationed in Noricum in what is now Austria. He is said to have saved a town from burning by throwing a single bucket of water on the fire which was consuming it.
He was a closet Christian during the persecution of Diocletian. When ordered to put a group of Christians to death, he refused and revealed his own Christianity.
He was martyred.
Further information on St. Florian can be found in Lives of the Saints or Saints Index on Catholic Forum