 Bradney proposes that Llantarnam has its origins in Nant Teyrnon and that Nant has evolved into Llan similar to Llancarfan (Nant Carfan) and Llanthony (Nant Honddu).From a c.1175 deed Bradney suggests that Emsanternon [was] ‘doubtless intended for’ Ynys nant Teyrnon – ‘the island by the brook of the Teyrnon’, while providing a footnote warning that ynys is often used for land situated next to a brook.The personal name Teyrnon, from the Mabinogion, is described as ‘a Lord of Gwent Iscoed and the best man in the world’, while the translation of the full name, Teirnyon Twryf-Vliant is ‘Teyrnon of the rustling fine linen’.