I'm not familar with it either, does this help maybe...
http://www.genuki.org.uk/big/wal/CGN/BangorTeifi/Ceredigion (Welsh pronunciation: [kɛrɛˈdɪɡjɔn]) is a county and former kingdom in mid-west Wales. As Cardiganshire (Welsh: Sir Aberteifi), it was created in 1282, and was reconstituted as a county under that name in 1996, reverting to Ceredigion a day later.[1] In extent the current county is more or less identical to the historic county.