The origin of the current name "Bohemian Forest" goes back to 400 BC. The Boii people spread across Europe between 400 BC and 8 BC. Boii is the Roman name of three ancient Celtic tribes, living in Transalpine Gaul (modern France), Cisalpine Gaul (northern Italy), and Bohemia, Moravia and western Slovakia. The European region of Bohemia owes its name to the Boii, who lived there until they were replaced by the Germanic Marcomanni and Serbian (Sorbian) ancestors as indicated in Administrado de Imperia in origins of Serbs the Land of Boiki also known as White Serbia. The Romans called it "Boiohaemum", a Latinization of the Germanic name of the region, meaning "the home of the Boii". The mountain range has been traditionally identified with "Γαβρήτα Ὕλη" (Gabreta Forest), mentioned in Strabo's Geographica and Ptolemy's Geographia. In the 1st century AD, the forest was inhabited by Gallo-Romans as well as by Germanic tribes in its northern part.