Esyllt is the Welsh form of Iseult (Isolde) — heroine of one of the great romantic tragedies of Western literature. **The Irish princess who fell in tragic love with the Cornish knight Trystan** after they accidentally drank a magic potion — central to the Welsh Triads (which predate the French versions). Generally interpreted as meaning "of fair regard."
Featured in the Welsh Triads and medieval Welsh romance.
Esyllt reduces to six — the number of Welsh Iseult.