Saint Teilo (Latin: Teliaus; also Eliud) was a leader of the Celtic Christian church in Wales during the 6th century. His exact dates of birth and death are unknown but Penally in Pembrokeshire is considered his birthplace. He was the son of Prince Ensig ap Hydwn ap Ceredig of Ceredigion, and a contemporary of his father's cousin, Saint David, with whom he is said to have travelled to Jerusalem on pilgrimage. Teilo is believed to have been both the Bishop of Llandeilo and of St David's. His head resides at Llandaff Cathedral after being kept for centuries on a farm at Maenclochog in Pembrokeshire. Bones found in St. David's Cathedral during restoration work at the turn of the 21st century were thought to be his, but scientific dating proved otherwise. Like most of the Welsh 'saints' of this period, Teilo was a monastic leader, and founded a 'llan' or monastic settlement which gave its name to the town of Llandeilo in Carmarthenshire. Several other places bear his name, and he is also believed to have preached or taught in Brittany. He is one of the patron saints of Llandaff Cathedral, and is said to have founded the original monastery at there. Saint Hywel was one of Teilo's disciples. His feast day is 9 February. A number of places named Llandeilo in Wales are named after him.