Asaph was a 6th-century Welsh bishop and monk who is traditionally recognized as the first leader of the diocese of St Asaph. Born in the region of Hen Ogledd to King Sawyl Penuchel and Gwenaseth, he became a disciple of Kentigern. According to historical accounts, he demonstrated his sanctity by bringing live coals to his mentor in an apron. Following Kentigern's departure for Strathclyde, Asaph was consecrated to succeed him, establishing the see in Wales.