Definition: "Hengelo" refers to a Germanic tribe in Europe during the Roman Empire who lived along the River Rhine. It was known for its strong religious beliefs, especially those related to Christianity. The term "hengel," however, is often used to denote the city of Heidelberg, Germany, which was a capital of the Hengelo dynasty from around 365 AD until it fell in 498 AD and was replaced by the Carolingian Empire.