Conradin left Bavaria in September 1267. His supporters' revolt was spreading from Sicily to Calabria; the Saracens of Lucera also rose up. Pope Clement urged Charles to return to the Regno, but he continued his campaign in Tuscany until March 1268, when he met with the Pope. In April, the Pope made Charles imperial vicar of Tuscany "during the vacancy of the empire", a move of dubious legality. Charles marched to southern Italy and laid siege to Lucera, but he then had to hurry north to prevent Conradin's invasion of Abruzzo in late August. At the Battle of Tagliacozzo, on 23August 1268, it appeared that Conradin had won the day, but a sudden charge by Charles' reserve routed Conradin's army.