Altamura Cathedral is founded by Emperor Frederick II of Swabia. It is one of the four Palatine cathedrals of Puglia, the others being San Nicola in Bari, Barletta Cathedral, and Acquaviva Cathedral.
An earthquake partially destroys Altamura Cathedral, after which it is renovated by Robert of Anjou.
Addition of the celebrated main portal of Altamura Cathedral (the date is uncertain but estimated as 14th or 15th century).
Major changes are made to the cathedral, including, unusually, switching the front and back around! The main facade originally faced west like most cathedrals, but it now faces east.