Tydecho was a 6th-century saint and hermit who lived in Wales. According to the life of Saint Padarn, he arrived in Wales from Armorica, a location that may refer to Brittany or a specific region in southeast Wales. As the son of Amwn Ddu and a cousin to Saint Cadfan, he traveled through Wales alongside his relative. Following the death of King Arthur, Tydecho chose the life of an anchorite, eventually settling in the Mawddwy region with his sister, Tegfedd.