sentences:  He was born around 1180-1182, making him a contemporary of Francis of Assisi, who later helped to change his life.According to some accounts, as a young man he took up arms to serve in the Ghibelline army.Once stationed in Poggibonsi, which was experiencing a period of strong economic prosperity, he abandoned his military career and married a young woman of the city, Buona de' Segni—traditionally called Buonadonna.