Penycloddiau is a hill in Flintshire, Wales, and one of five Marilyns in the Clwydian Range. The hill, like Foel Fenlli and Moel Arthur to the south, has an Iron Age hillfort at its summit. It covers 26 ha making it one of the largest hillforts in Wales. In 2017, excavations by the Clywdian Range Archaeology Group unearthed a significant number of 4,000-year-old stone tools from the Bronze Age, the discovery indicates human activity occurred much earlier than first thought in the area.Wikipedia