Furlong the fundamental unit of land measurement. A furlong was forty rods, an acre four by 40 rods, or four rods by one furlong, and thus 160 square rods. At the time, the Saxons used the North German foot, which was 10 percent longer than the foot of today. When England changed to the shorter foot in the late 13th century, rods and furlongs remained unchanged, since property boundaries were already defined in rods and furlongs. The only thing that changed was the number of feet and yards in a rod or a furlong, and the number of square feet and
Tadhg Furlong and Irish Cup. Ahead of the 2014–15 season, Furlong was promoted from the Leinster Academy to the senior squad. Furlong made his Ireland senior debut on 29 August 2015 against Wales in a warm-up game for the 2015 Rugby World Cup. He was named in the Ireland squad for the World Cup on 1 September 2015. In November 2016, Furlong started for Ireland in the Autumn Internationals, including the historical victory over New Zealand on 15 November 2016. He also played for Ireland in the 2017 Six Nations Championship. Furlong was selected in Warren Gatland's squad for the 2017 British