It's interesting that when looking deeper into Greek philosophy you find that most contributions and continuation of greek philosophy were highly researched in the Islamic period. Contributions of the likes of Avicenna offer the most comprehensive review of greek philosophy the world has ever known. Particularly Aristotle.,(reply>), @Asif Khan the same was thought of many greek and Christian thinkers aswell. Most of them in fact. Atleast he wasn’t excommunicated or executed like the latter.,(reply>), you do realize Avicenna was a "mushrik", a heretic, according to the imams of the hijaz, the custodians of the two holy mosques.