Early Irish law texts record a wide variety of units of measurement, organised into various systems.
These were used from Early Christian Ireland (Middle Ages) or perhaps earlier, before being displaced by Irish measure from the 16th century onward.
A magh-space was a unit set at the distance from which a cock-crow or bell could be heard.
[1] and "Catalogue of the Irish manuscripts in the British Museum v.1" gives ceithri gráine an t-órdlach (4 grains in the thumb-length).
Stair Ercuil ocus a bás: the life and death of Hercules mentions ceim curadh (warrior's paces).