Fonds GB 0210 CILYBYLL - Cilybebyll Estate Records,

Alice, daughter of Thomas ap Griffith Goch of Ynys-arwed, Glamorgan, married Griffith ap John ap Lewis. Alice was probably the heiress of Cilybebyll, as some pedigrees describe Thomas ap Griffith Goch as of Cilybebyll. Alice and Thomas's son, Lewis Griffith, who was the first of the family to use a surname, married (secondly) Jenet Herbert, and had issue a daughter and heir, Jenet, who married George Herbert, the fourth son of Matthew Herbert of Swansea. The Herbert family of Swansea was part of the same clan as the Herbert family, earls of Pembroke, and was itself the source of the Herbert families of Cilybebyll, Cogan Pill and White Friars.

The estate remained in the hands of the Herberts until the death, in 1771, without heirs, of Elizabeth Herbert who had married Richard Turberville (c.1708-1777, .) Elizabeth, who was the daughter of Richard Herbert (d. 1728) and Elizabeth Lloyd of Cilymaenllwyd, left Cilybebyll to her mother's family.

Her heir was John Herbert Lloyd (d. 1817), the son of John William Lloyd (d. 1752) of Carmarthen. He was succeeded by his sister Jane (d. 1828), the wife of William Bassett. Jane was succeeded by her kinswoman Jane Brand (d. 1849), the daughter of John Jones (d. 1787) of Brawdy, Pembrokeshire, and wife of Henry Leach (d. 1848) of Milford. Their son Francis Edwardes Leach (1805-1865) assumed the surname Lloyd on inheriting Cilybebyll on the death of his mother.

Francis's son, Herbert Lloyd (1838-1914) of Cilybebyll, married in 1864 with Frances Harriette (1838-1929), daughter of S. G. Purdon of Tinerara, Ireland. Their eldest son John Herbert Purdon Lloyd (1868-1957) inherited Cilybebyll on his father's death.