Tathe
Encyclopedia
A tathe or tate is a unit
Units of measurement
A unit of measurement is a definite magnitude of a physical quantity, defined and adopted by convention and/or by law, that is used as a standard for measurement of the same physical quantity. Any other value of the physical quantity can be expressed as a simple multiple of the unit of...

 of area
Area
Area is a quantity that expresses the extent of a two-dimensional surface or shape in the plane. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat...

 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 ballibetagh is far larger in Fermanagh than in Monaghan
Monaghan
Monaghan is the county town of County Monaghan in Ireland. Its population at the 2006 census stood at 7,811 . The town is located on the main road, the N2 road, from Dublin north to both Derry and Letterkenny.-Toponym:...

. 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
Monaghan
Monaghan is the county town of County Monaghan in Ireland. Its population at the 2006 census stood at 7,811 . The town is located on the main road, the N2 road, from Dublin north to both Derry and Letterkenny.-Toponym:...

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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