Kalam

Taqi al-Din Ahmad ibn Taymiyyah (1263–1328 CE) was a Hanbali jurist and theologian in Mamluk Damascus and Cairo. He critiqued speculative theology and practices such as tomb visitation, issued influential fatwas, and was imprisoned repeatedly. His writings shaped later Islamic reform movements.

The Mu'tazilite school was a major rationalist theological movement of the Abbasid era that placed reason at the center of Islamic thought, shaping centuries of debate over divine justice, free will, and the nature of the Quran.