Fonds GB 0210 MYNACHTY - Mynachty Estate Records,

A Gwyn family had owned the Mynachty since the sixteenth century. Failing in the male line the estate passed to Elizabeth who married Morgan Gwynn ap Lewis Gwyn ap Gruffydd of Cil-fforch in the parish of Henfynyw, Cardiganshire. The earliest deed relating to a member of the Gwynne family appears to be a lease of 1704 to Lewis Gwynn of Mynachty, esquire, grandson of Morgan and Elizabeth. Cil-fforch appears to have been subsumed into the Mynachty estate, being mentioned in a marriage settlement of 1706, and rented out in 1785.

The house of Mynachty, built in the middle of the 17th century, was pulled down in the middle of the 18th century, and Lewis Gwynne built a new house on the site. He died in 1805, a bachelor and without issue, and left Mynachty (and £150,000 in gold and stocks) to his cousin, the Rev. Alban Thomas Jones (1751-1819) of Tyglyn and Susannah Maria (nee Jones) his second wife, for their lives. Lewis Gwynne's mother was sister to Alban's mother, and to Susannah's grandfather.

Alban Thomas, having added his wife's surname to his own on marrying, now added Gwynne, to become Alban Thomas Jones Gwynne, founding the third Gwynne family of Mynachty. This family held possession of the Mynachdy estate until it was sold by Alban Lewis Gwynne (b. 1880) to a Captain Briggs.