Nicomachus

Nicomachus of Gerasa (Ancient Greek: Νικόμαχος ὁ Γερασηνός; c. 60 – c. 120 AD) was a Greek Neopythagorean philosopher from Gerasa (now Jerash, Jordan).

Like many Pythagoreans, Nicomachus wrote about the mystical properties of numbers, best known for his works Introduction to Arithmetic and Manual of Harmonics, which are an important resource on Ancient Greek mathematics and Ancient Greek music in the Roman period. Nicomachus' work on arithmetic became a standard text for Neoplatonic education in Late antiquity, with philosophers such as Iamblichus and John Philoponus writing commentaries on it. A Latin paraphrase by Boethius of Nicomachus's works on arithmetic and music became standard textbooks in medieval education.

Source: Wikipedia — https://en.wikipedia.org/wiki/Nicomachus