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In the Elizabethan play The Birth of Merlin, the daughter of Lord Donobert and a maiden at Aurelius Ambrosius’ court.

She was betrothed to Cador of Cornwall until her sister, Modestia, convinced Constantia to join her in a nunnery.

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Source
The Birth of Merlin, or the Childe Hath Found His Father | Attributed to William Shakespeare and William Rowley, 1662