From Wikipedia: https://en.wikipedia.org/wiki/Golden_Gate_(Diocletian%27s_Palace)

The Golden Gate (Croatian: Zlatna vrata, Latin: Porta Aurea), or "the Northern Gate", is one of the four principal Roman gates into the stari grad (old town) of Split. Built as part of Diocletian's Palace, it served as the main gate through which the Emperor entered the complex and was elaborately decorated to mark its status. Over the course of the Middle Ages, the gate was sealed off and lost its columns and statuary. It was reopened and repaired in modern times and now serves as a tourist attraction.