Bernicia was an early medieval kingdom located in what is now northern England and southern Scotland. It emerged in the 6th century and was part of the larger region known as Northumbria. The kingdom was known for its strong military presence and played a significant role in the spread of Christianity in the area. The capital of Bernicia was likely Bamburgh, which served as a key center for trade and governance. The kingdom was ruled by several notable kings, including Aethelfrith, who expanded its territory. Over time, Bernicia eventually merged with Deira, another kingdom, to form the unified kingdom of Northumbria.