Tegid Foel is the husband of Ceridwen

Ceridwen

In Welsh medieval legend, Ceridwen , also spelled Cerridwen, was an enchantress, mother of Morfran and a beautiful daughter Creirwy. Her husband was Tegid Foel, and they lived near Bala Lake in north Wales...

 in Welsh mythology

Welsh mythology

Welsh mythology, the remnants of the mythology of the pre-Christian Britons, has come down to us in much altered form in medieval Welsh manuscripts such as the Red Book of Hergest, the White Book of Rhydderch, the Book of Aneirin and the Book of Taliesin....

. His name rendered into English would be "Tacitus the Bald". In folklore, Tegid Foel is associated with Llyn Tegid

Bala Lake

Bala Lake is a large lake in Gwynedd, Wales. It was the largest natural body of water in Wales prior to the level being raised by Thomas Telford to help support the flow of the Ellesmere Canal. It is long by wide, and is subject to sudden and dangerous floods. The River Dee runs through it and...

 (Bala Lake) in Gwynedd

Gwynedd

Gwynedd is a county in north-west Wales, named after the old Kingdom of Gwynedd. Although the second biggest in terms of geographical area, it is also one of the most sparsely populated...

 and may have been the tutelary deity of that lake.

Tegid Foel is known chiefly from the story of Taliesin

Taliesin

Taliesin was an early British poet of the post-Roman period whose work has possibly survived in a Middle Welsh manuscript, the Book of Taliesin...

's birth, first recorded in full in the 16th century but dating to a much earlier period. According to the story, he lived by Llyn Tegid in the region of Penllyn

Penllyn

Penllyn is a former civil parish in the Welsh county of Gwynedd. The parish was created in 1894 from the part of Criccieth parish that lay outside the ancient borough. It was abolished in 1934, and divided between Llanystumdwy and Criccieth....

 with his wife, the sorceress Ceridwen. Together they had two children, a beautiful daughter named Creirwy and a son Morfran, called Afagddu

Afagddu

Morfran is a figure in Welsh mythology. Usually portrayed as a warrior under King Arthur, he is noted for the darkness of his skin and his hideousness...

 ("utter darkness") because of his dark skin and hideous looks. Tegid's name is mentioned several times in Welsh literature in the patronymic

Patronymic

A patronym, or patronymic, is a component of a personal name based on the name of one's father, grandfather or an even earlier male ancestor. A component of a name based on the name of one's mother or a female ancestor is a matronymic. Each is a means of conveying lineage.In many areas patronyms...

 of his more famous son Mofran; it appears in the Mabinogion

Mabinogion

The Mabinogion is the title given to a collection of eleven prose stories collated from medieval Welsh manuscripts. The tales draw on pre-Christian Celtic mythology, international folktale motifs, and early medieval historical traditions...

tales Culhwch and Olwen

Culhwch and Olwen

Culhwch and Olwen is a Welsh tale about a hero connected with Arthur and his warriors that survives in only two manuscripts: a complete version in the Red Book of Hergest, ca. 1400, and a fragmented version in the White Book of Rhydderch, ca. 1325. It is the longest of the surviving Welsh prose...

and The Dream of Rhonabwy

The Dream of Rhonabwy

The Dream of Rhonabwy is a Middle Welsh prose tale. Set during the reign of Madog ap Maredudd, prince of Powys , it is dated to the late 12th or 13th century. It survives in only one manuscript, the Red Book of Hergest, and has been associated with the Mabinogion since its publication by Lady...

, and in Welsh Triads

Welsh Triads

The Welsh Triads are a group of related texts in medieval manuscripts which preserve fragments of Welsh folklore, mythology and traditional history in groups of three. The triad is a rhetorical form whereby objects are grouped together in threes, with a heading indicating the point of likeness...

 24 and 41. Apart from Creirwy and Morfran the Welsh genealogies also name other children of Tegid. The Vitae Sanctorum Britanniae et Genealogiae gives the following lineage: "Afan Buellt son of Cedig son of Ceredig son of Cunedda

Cunedda

Cunedda ap Edern , was an important early Welsh leader, and the progenitor of the royal dynasty of Gwynedd.-Background and life:The name Cunedda derives from the Brythonic word , meaning good hound. His genealogy is traced back to Padarn Beisrudd, which literally translates as Paternus of the...

Wledig by Degfed ["Tenth"] daughter of Tegid Foel"; Rawlins MS B gives another genealogy naming another daughter, Dwywai.