Pliny the Elder states: That portion of land used to be known as a "jugerum," which was capable of being ploughed by a single "jugum," or yoke of oxen, in one day; an "actus" being as much as the oxen could plough at a single spell, fairly estimated, without stopping.
[3]Pliny (Book VIII, Chapter 16) also used jugerum as a measure of length.
The translator (Bostock) speculated that the jugerum length measurement was equivalent to the Greek plethron, about 30 meters or 100 feet.
The uncial division as was applied to the iugerum, its smallest part being the scrupulum of 100 sq ft or 9.2 m².
[5]In Gaul, half of a jugerum was called an arepennis (“head of a furrow”).