1) Medieval Welsh saint 
Saint Tathan (also known as Tatheus) is claimed to be a Celtic saint, who travelled from Ireland to Wales where he founded a Christian church. He is reckoned an early abbot of Caerwent and has dedications at Llanvaches, near Caerwent, also known as Llandathan, and at St Athan. ==Origins== William Jenkins Rees, in his book Lives of the Cambro Briti...