The Roman city of Felix Romuliana, also known as Romuliana, is an ancient archaeological site located in present-day Serbia. It was built in the late 3rd century AD and is named after the Roman Emperor Galerius, who was born there. The city features impressive ruins, including a palace complex, temples, and fortifications, showcasing the architectural style of the time. Felix Romuliana was recognized for its cultural and economic significance during the Roman Empire. It served as a military and administrative center, reflecting the importance of the region. In 2007, it was designated a UNESCO World Heritage Site, highlighting its historical value.