Saint Materiana was a 5th-century Welsh princess, identified as the eldest daughter of King Vortimer the Blessed. Following her father's passing, she governed the region of Gwent alongside her husband, Prince Ynyr. Tradition suggests that she and her eldest son, Ceidio, escaped a fire at her grandfather's wooden castle by seeking refuge on the hill of Carn Fadryn. She is recognized as a patroness for several religious sites across Cornwall and Wales, including churches in Minster, Tintagel, and Trawsfynydd.