Qusta ibn Luqa, also known as Costa ben Luca or Constabulus[1] (820–912) was a Melkite Christian physician, philosopher, astronomer, mathematician and translator.
At the request of wealthy and influential commissioners, Qusta translated works on astronomy, mathematics, mechanics and natural science from Greek into Arabic.
The extant editions of medical works show that he was thoroughly acquainted with Hippocratic-Galenic humoral medicine—the theoretical system that constituted the basis of formal medicine in Islam.
Qusta's works, many listed in the Fihrist of Ibn al-Nadim, dealt with contemporary science, medicine, astronomy and philosophy.
[6] Research in 2021 traces the discovery of pulmonary circulation to Qusta's book A Treatise on the Difference Between Spirit and Soul (Arabic: رسالة في الفرق بين الروح والنفس).