- Cornelius O'Brien was the son of Henry O'Brien of Ennis, county Clare and Helen O'Callaghan of Kilgorey. In 1816 he married Margaret, daughter of Peter Long of Waterford and widow of James O’Brien of Limerick. Trained in the Law Cornelius O'Brien represented county Clare in Parliament from 1832 to 1847. He regained his seat in July 1852 and died in 1857. In the early 1850s he purchased some of the estate of the Crowe family. At the time of Griffith's Valuation he held land in six baronies of county Clare but his estate was mainly located in the parish of Kilmacrehy, barony of Corcomroe and in the parishes of Dysert and Inagh, barony of Inchiquin and Feakle, barony of Tulla Upper. His son George O'Brien entered the King's Inns in 1855 under 20 years of age and married Helen Butler of Bunnahow. George O'Brien died in 1867. The Birchfield property then passed to Cornelius Keogh by his marriage to Mary O’Brien, youngest daughter of Cornelius O'Brien. William Henry McGrath, stated to be a brother in law of George O'Brien when entering the King's Inns, came into possession of Cornelius O’Brien’s Toonagh estate by his marriage to Bridget O’Brien in 1852. George O'Brien married Ellen, daughter of William Butler of Bunnahow. She married secondly Charles Vyse of Fermoy, county Cork, who is recorded as owning 1,340 acres in county Clare in the 1870s. The estate of Charles Vyse amounting to 1,677 acres in the barony of Corcomroe including part of Birchfield and Seamount House was advertised for sale in April 1880. The sale rental gives details of the O'Brien title to the Birchfield estate.
- The Crowe family were living at Nutfield, near Ennis, county Clare in the 1780s. Burke records that Thomas Crowe, second son of Robert Crowe of Nutfield, married a Miss Wainwright of Dublin and had a son, Thomas Crowe of The Abbey, Ennis. He married Ellen Tymons and had six sons and four daughters. The eldest son, Thomas Crowe ,born in 1803, became a barrister and lived at Dromore House, parish of Ruan, barony of Inchiquin which he owned in fee. In 1838 he married Isabella Hume of Humewood, county Wicklow. In the mid 19th century Thomas Crowe held land in seven baronies of county Clare but the main part of his estate was concentrated in the parishes of Ruan and Inagh, barony of Inchiquin and in the parishes of Kilfarboy, Killard and Kilmurry, barony of Ibrickan. In 1857 he bought over 2,000 acres of the estate of the Marquis of Thomond in the barony of Inchiquin. His youngest brother, Wainwright Crowe, lived at Cahircalla, parish of Drumcliff, barony of Islands. In the 1870s Thomas Crowe of Dromore owned 6,121 acres in county Clare and the representatives of his brother, Wainwright Crowe, owned a further 3,126 acres. By 1909 Wainwright F. Crowe had agreed to sell over 1,600 acres to the Congested Districts' Board. The mansion house of Dromore and almost 1,000 acres of untenanted land was still in the possession of the Crowes in 1906. Thomas Crowe's grandson, another Thomas Crowe, sold Dromore in 1936.
- In the 1870s the Reverend James William Rynd of Galbally, county Tipperary, owned 685 acres in county Clare and 198 acres in county Westmeath. He was the seventh son of James Rynd of Dublin, whose great grandfather was granted lands in county Fermanagh under the Act of Settlement. The Reverend James Rynd married Eliza daughter of Robert Crowe Fleming of Nutfield, county Clare.
- In his will dated 20 Aug 1767 James Crowe of Dublin leaves the lands of Nutfield otherwise Drumconora, county Clare and the other lands purchased from the trustees of Mrs Leslie to his eldest son Robert. He also refers to the purchase of named lands from Charles McDonnell, the Earl of Inchiquin, Sir Lucius O'Brien and Anthony Wolfe. Some of these lands are included in the sale of the 2,973 acre estate of Arthur Cecil Fleming Crowe and others on 2 August 1850 in the Encumbered Estates Court. The Reverend James Rynd was the petitioner. He was married to Eliza daughter of Robert Crowe Fleming of Nutfield. Rosslevan was included in this sale and the Reverend Rynd was the immediate lessor of Rosslevan at the time of Griffith's Valuation. Cornelius O'Brien bought about 1,700 acres of the Crowe estate in the early 1850s. Dorothea Tottenham is recorded as the daughter and heiress of George Crowe in the Tottenaham entry in Burke's ''Irish Family Records''. In 1814 she married Charles Tottenham of Glenfarne Hall, county Leitrim. At the time of Griffith's Valuation she held land in the parishes of Templemaley, barony of Bunratty Upper and Tulla, barony of Tulla Upper.