Frederick de la Tranche (1586 poitou, France Married 1576 Northumberland , England to Margaret Sutton and he died in 1580 in northumberland England) Frederick and Margaret had a Thomas Trench who married in 1610 to Katherine Brooke daughter of Richard Brooke and had a son named Frederic Trench born in England and went to Irelane in 1631. He died in 1669 Galway Ireland.They also had a son the Rev. James Trench who married Margaret Montgomery who was a daughte of the viscount Montgomery of Ards. and they had a daughter named Anna Trench born in 1613 in Clongell, County Meath, Ireland and she died 1664 in Galway Ireland.
Anna Trench married her 1st cousin Frederick Trench.They had a son Frecerick Trenchborn in 1633 Galway co. Ireland and he died Nov 1704 in Galway county Ireland.He married Elizabeth Warburton a daugter of Richard Warburton and Elizabeth anne L"estrange.
Frederick and Elizabeth had a son Frederick Trench born 1681 and died in 1752 who married Elizabeth Eyre, a daughter of John Eyre and Margery Preston Frederick and Elizabeth are the anscestors of the Trench's of Clancarty, Trench's of Ashetown, and other Trench's if my memory is correct i don't have my books in fronto of me just my family tree charts.
Frederick and Elizabeth had a son William Trench who died in 1790 but married in 1757 to Anne Colpoys who was a daughter of Sir John Colpoys.
This william had a sonWilliam Power Trench (24 Oct 1771 Galway, Ireland Married 04 Jan 1803 Clarendon, Jamaica to Janet Stewart daughter of William Stewart and he died 30 June 1848 Belleveiw, Jamaica and they are the parents to your Jane (Trench) St. John and my Daniel Power Trench