St Pius I was the tenth Pope from 140 to 154. It was believed he was born at Aquileia, Italy which was about 400 miles or 644 km northeast of Rome. He decreed that Easter should only be celebrated on Sunday. Much of his time was spent warding off the corruption of several heretics in Rome and he had the assistance of St Justin in defending the Christian doctrine. The oldest church in Rome was also built during his pontificate as the original church of Santa Pudenziana was constructed. His Feast day is celebrated on July 11.