Do you put a Bhliain before the year in Irish?
Because the structure of the Irish is "the year No. ####" and the number is in counting numbers (maoluimhreacha, i.e., a haon, a do), not cardinal numbers, you need always insert a bhliain before the year (bunuimhreacha, i.e., aon, dha). Thus, "a bhliain noo" means "in the year No. ###".