The Boii (Latin plural, singular Boius; Greek ) were a Gallic tribe of the later Iron Age, attested at various times in Cisalpine Gaul (northern Italy), Pannonia (Hungary and its western neighbours), parts of Bavaria, in and around Bohemia (after whom the region is named in most languages; comprising the bulk of the Czech Republic), and Transalpine Gaul. In addition the archaeological evidence indicates that in the 2nd century BC Celts expanded from Bohemia through the Klodzko Valley into Silesia, now part of Poland and the Czech Republic.