Morgan Tud is the head physician of King Arthur's

King Arthur

King Arthur is a legendary British leader of the late 5th and early 6th centuries, who, according to Medieval histories and romances, led the defence of Britain against Saxon invaders in the early 6th century. The details of Arthur's story are mainly composed of folklore and literary invention, and...

 court in early Arthurian tales.

In the medieval tale, Geraint son of Erbin

Three Welsh Romances

The Three Welsh Romances are three Middle Welsh tales associated with the Mabinogion. They are versions of Arthurian tales that also appear in the work of Chrétien de Troyes. Critics have debated whether the Welsh Romances are based on Chrétien's poems or if they derive from a shared original...

, Morgan is called to treat Edern ap Nudd

Edern ap Nudd

Edern ap Nudd is a warrior of Arthur's court in early Arthurian tradition. As the son of Nudd , he is the brother of Gwyn, Creiddylad and Owain ap Nudd...

, Knight of the Sparrowhawk, following the latter's defeat at the hands of his adversary Geraint

Geraint

Geraint is a character from Welsh folklore and Arthurian legend, a king of Dumnonia and a valiant warrior. He may have lived during or shortly prior to the reign of the historical Arthur, but some scholars doubt he ever existed...

. He is later called on by Arthur to treat Geraint himself, and stayed for almost a month nursing the knight. When Geraint claims that he has healed, Arthur calls on Morgan to deliver his verdict before allowing Geraint to leave his sick-bed.