Nicomachus wrote from Gerasa, a city in the Roman province of Syria, around the turn of the second century CE, at a point when Neopythagorean philosophy was reviving Pythagorean number mysticism as a serious intellectual movement within the wider Greco-Roman philosophical world. His arithmetic treatise became one of the standard texts defining the quadrivium, the four advanced mathematical arts, arithmetic, geometry, music and astronomy, that late antique and medieval educators treated as the necessary preparation for philosophical and theological study.
Its transmission into the Latin-speaking West runs through a single crucial intermediary: the Roman philosopher Boethius, writing around 500 CE, produced not a literal translation but a Latin adaptation, De Institutione Arithmetica, that reorganized and rephrased Nicomachus's material for a Latin audience. Boethius's version, rather than the Greek original, became the arithmetic textbook used across medieval European schools for roughly a thousand years, meaning that most medieval readers who encountered Pythagorean number theory encountered it filtered through Boethius's Latin rendering rather than through Nicomachus's own words, a chain of transmission this atlas records as central to understanding how ancient number mysticism reached medieval Christian Europe at all.