Saint Tathana was a 5th-century saint of South Wales.^[1] Very little is known of her actual life. She was born c.465 AD and she was the granddaughter of Meuric ap Tewdric of Trebeferad. She lived a humble life as a virgin and hermit in a mud hut on the River Thaw, and was associated with the monastic school of Llantwit Major where she was buried.

There is a tradition that the village of St Athan in the Vale of Glamorgan is named after Tathana, however it is thought that the male Saint Tathan is more probable.^[2] The parish church is dedicated to Tathan.

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