1600, The O’Mahonys, 63 Ploughlands of Ivagh (Mizen Peninsula), West Cork and the Custom of Tanistry whereby O’Mahony is made Lord of the Country by McCarthy Reagh by delivering to him a White Rod and he in turn pays to the McCarthys 10 shillings for every ploughland and the Genealogy of this O’Mahony Sept.

Much of this land fell into the hands of The Earl of Cork/Boyle, Sir William Hull, The Beecher Family and the Kenmare Estate/Brownes of Kenmare.

Thomas Larcom, the first director of the Ordnance Survey of Ireland, made a study of the ancient land divisions of Ireland and summarised the traditional hierarchy of land divisions thus:[9][12]   10 acres – 1 Gneeve; 2 Gneeves – 1 Sessiagh; 3 Sessiaghs – 1 Tate or Ballyboe; 2 Ballyboes – 1 Ploughland, Seisreagh or Carrow; 4 Ploughlands – 1 Ballybetagh, or Townland; 30 Ballybetaghs – Triocha Céad or Barony.

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