Iolo Morganwg
Goursez Vreizh (officially Breudeuriezh Drouized, Barzhed hag Ovizion Breizh) is the national gorsedd of Brittany ("Breizh" in Breton). It often has delegates from the Welsh gorsedd and Gorsedh Kernow in Cornwall. The Breton organisation is itself based on the Welsh-based Gorsedd, which was founded by Iolo Morganwg in 1792.