Heidelberg is a city in Baden-Württemberg, Germany. The name Heidelberg is an adaptation of Heidelbeerenberg (the German for Blueberry Mountain). Approximately 600,000 years ago, the "Heidelberg Man", whose jaw-bone was discovered in 1907, the earliest evidence of human life in Europe, died at nearby Mauer. In the fifth century B.C.E., there was a Celtic fortress of refuge and place of worship on the Heiligenberg, or "Mountain of Saints". Both places can still be identified. In 40 C.E. a fort was built and occupied by the 24th Roman cohort and the 2nd Cyrenaican cohort. The Romans would build and maintain castra (permanent camps) and a signalling tower on the bank of the Neckar, and build a wooden bridge across the Neckar. The first civilian settlements would develop under the protection of the camp. The Romans would remain until 260 C.E., when the camp was conquered by German tribes.