Named as a beneficiary in the Will of her mother-in-law Gaynor Meredith of Menaughty Gwyn, widow (1697), and called Mary Meredith of Pengwern.
Sole Executrix of her husband's Will (1705)
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Abstract of the Will of Mary Meredith of Pengwern in the parish of Llanwnda in the County of Caernarvon, Widow, written 17 Dec 1718, proved 24 Mar 1719. 3
Gives & bequeaths 20 shillings to the poor of Llanwnda.
Gives & bequeaths to her daughter Lowry Meredith two bedsteads, three feather beds, twelve blankets and rugs, a couple of chairs, a cupboard press, a chest that currently stands in the room above the parlour and buttery in Pengwerne, one large brass pot and one small brass pot.
Constitutes, nominates & appoints her son Humphrey Meredith sole executor and residuary legatee of her last will and testament.
Witnesses: William Griffith, Hugh [Griffith], William Williams