Diocletian's Palace (, ) is an ancient palace built by the Roman emperor Diocletian at the turn of the fourth century AD, that today forms about half the old town and city center of Split, in Croatia. While it is referred to as a "palace" because of its intended use as the retirement residence of Diocletian, the term can be misleading as the structure is massive and more resembles a large fortress: about half of it was for Diocletian's personal use, and the rest housed the military garrison.