Galen, a famous Greek physician, is historically known for his extensive contributions to anatomy, physiology, and medicine.
He is often referred to as Abul AlArwah, meaning ‘Father of Spirits’, because of his significant work on the concept of ‘Arwah’ (spirits) in the body.
In Unani medicine, Galen’s theories deeply influenced the understanding of vital, natural, and psychic spirits that control various body functions.
Erasistratus and Herophilus were also Greek physicians, but they are not known by this title.
Aristotle was a philosopher whose work laid foundational ideas for many sciences, but he is not referred to as Abul AlArwah.
Thus, the correct answer is Galen.