A tathe or tate is a unit of area which was used in Fermanagh and Monaghan, equivalent to 60 Irish acres.
Four tathes make a "quarter" of land, four quarters make a "ballibetagh" and, in Fermanagh, seven ballibetaghs make a "barony", of which there were seven. However, the measure of a ballybetagh is far larger in Fermanagh than in Monaghan. In total at this period in time (1609), it was estimated that Fermanagh which had 51 ballibetaghs and a half of "chargeable lands" contained the same area as Monaghan which had 100 ballibetaghs.
A quick survey of 1608 found the Tathe to be only half the extent assigned to it by the Irish which was 60 native Irish acres.
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