The term Celtic refers to a group of languages and cultures that originated in Iron Age Europe. GAELIC, ERSE, DRUID, IRISH, and AVALON are all related to the Celtic culture. GAELIC is a language spoken in Scotland, Ireland, and the Isle of Man. ERSE is another name for the IRISH language. Druids were members of an ancient Celtic priesthood. IRISH is the name of the language spoken in Ireland. AVALON is a legendary island featured in Arthurian legend.