The lamb on the city shield is a biblical image of Jesus Christ, and the same image that represented 7th-century bishop St Wilfrid, the city's patron saint who is historically linked to the city's establishment. The "PP" on the city shield stands for "Princeps Pacis" (Prince of Peace), another title for Christ invoking Him as protector of the city, though it is also often taken to stand for the city's nickname "Proud Preston". In fact, there were originally three letters "P" on the coat of arms, with one being lost over time.[47]