The Dacian Kingdom was an ancient state located in the region that is now modern-day Romania and parts of Bulgaria, Serbia, and Hungary. It flourished from around the 1st century BC until its conquest by the Roman Empire in AD 106. The Dacians were known for their rich culture, advanced metallurgy, and strong military. The kingdom was ruled by notable kings, including Burebista, who unified the Dacian tribes and expanded the territory. The Dacians are often remembered for their fierce resistance against Roman expansion, which ultimately led to the famous Dacian Wars initiated by Emperor Trajan.