Francis grew up on dreams of glory, encouraged by his father, who wanted him to become a knight. In his teen years, however, he showed little of the discipline necessary for anyone who aspired to knighthood. Francis and his gang of friends, mostly wealthy youths who had plenty of money and time, were given to partying, practical jokes, and idleness. Like the others, he cared little for anything beyond the pleasures of the moment, but even then, Francis distinguished himself by his generosity, both to his friends and to the poor.
The teenaged Francis little suspected how soon his sheltered world would be destroyed. At that point, much of Italy was caught in a struggle with the Holy Roman Empire, a confederation of German principalities that controlled much of Europe, but in 1197, Assisi declared its independence. The foreign rulers of Assisi, loyal subjects of the empire, fled to the nearby town of Perugia, whose people had long been enemies of Assisi. In 1201, Perugia declared war on Assisi, and Francis was taken prisoner during the Battle of Ponte San Giovanni in November 1202.
He was held captive in Perugia for a year, during which time he began suffering health problems. Francis had always been weak, and his years of drinking and staying out late had only further weakened him; now confinement added to ailments that he would suffer throughout his life. At the age of twenty-two, he seemed like an old man, and he spent weeks in bed. When he could finally walk again, he found that something had changed.