Coleshill began life in the Iron Age, before the Roman conquest of 43AD at the Grimstock Hill Romano-British settlement, north of the River Cole. Evidence of hut circles was found by archaeologists at the end of the 1970s. These excavations showed that throughout the Roman period there was a Romano-Celtic temple on Grimstock Hill. It had developed over the earlier Iron Age huts and had gone through at least three phases of development. The area was at the junction of two powerful Celtic Tribes – the "Coritanii" to the east from Leicester, and to the west the "Cornovii" from Viroconium Cornoviorum.