In the Elizabethan play The Birth of Merlin, the son of the Earl of Gloucester. He was a member Aurelius Ambrosius’s court.
He wanted to marry Modestia, the daughter of Lord Donobert, but she decided to enter a nunnery.
Source
The Birth of Merlin, or the Childe Hath Found His Father | Attributed to William Shakespeare and William Rowley, 1662