Born Abu Hamid Muhammad ibn Muhammad al-Ghazali in Tus, near Mashhad in today’s Iran. Raised in a region shaped by Seljuk power and vibrant scholarly networks, he later became one of Sunni Islam’s most influential voices.

After his father died, he and his brother Ahmad were entrusted to a pious friend who supported their studies. In local madrasas he memorized foundational texts and learned Arabic religious sciences amid Khurasan’s busy intellectual life.

Traveled to Jurjan to deepen his Shafi‘i jurisprudence and legal theory under noted teachers. The journey exposed him to disciplined madrasa methods and the competitive culture of scholarly debate in eastern Iran.

Entered the Nizamiyya of Nishapur and studied under Imam al-Haramayn al-Juwayni, a leading Ash‘ari theologian. He trained in dialectical theology, logic, and usul al-fiqh, quickly earning a reputation for sharp disputation.

After al-Juwayni’s death, he attached himself to the Seljuk vizier Nizam al-Mulk, who patronized scholars and the Nizamiyya system. In courtly gatherings he debated jurists and theologians, gaining political visibility and prestige.

Nizam al-Mulk appointed him to teach at the celebrated Nizamiyya in Baghdad, one of the Islamic world’s premier institutions. He lectured to large audiences of scholars and officials, shaping Sunni legal and theological discourse.

Nizam al-Mulk was assassinated, and Sultan Malik-Shah soon died, destabilizing Seljuk politics. The uncertainty surrounding patronage and factional rivalry intensified pressures on scholars in Baghdad, including al-Ghazali’s own position.

He suffered a profound crisis of doubt and sincerity, describing an inability to speak and teach despite his fame. Leaving his post and family wealth behind, he set out seeking certainty through ascetic practice and inner reform.

In Damascus he lived in seclusion, devoting himself to prayer, fasting, and meditation within the precincts of the Umayyad Mosque. The retreat strengthened his attraction to Sufi disciplines and reframed scholarship as moral purification.

He traveled to Jerusalem and continued his retreat near the Dome of the Rock, reflecting on mortality and spiritual accountability. The city’s sacred landscape and pilgrimage culture reinforced his conviction that ethics must shape belief and law.

He undertook the Hajj in Mecca and visited the Prophet’s Mosque in Medina, integrating pilgrimage with a program of inner renewal. These journeys anchored his authority in lived devotion, not merely disputation and formal credentials.

During years of travel and seclusion he composed large sections of Ihya' Ulum al-Din, blending law, theology, and Sufi ethics. The work offered practical guidance on worship and character, and it became a cornerstone of Sunni piety.

He produced Tahafut al-Falasifa, criticizing Avicenna-inspired metaphysics on issues like eternity of the world and God’s knowledge of particulars. The book reshaped debates on reason and revelation, later provoking Ibn Rushd’s rebuttal.

Pressed by officials and concerned for public guidance, he resumed teaching at the Nizamiyya in Nishapur. He emphasized sincerity, orthodox theology, and disciplined spirituality, attempting to reform scholarly culture from within institutions.

He returned to Tus, teaching select students and cultivating a modest khanqah-like setting alongside legal instruction. This quieter period allowed him to refine his synthesis of Shafi‘i law, Ash‘ari theology, and Sufi practice.

In Al-Munqidh min al-Dalal, he narrated his intellectual journey through philosophy, theology, and Sufism to explain how he sought certainty. The autobiographical clarity helped later readers understand his critique of empty formalism in learning.

He died in Tus, remembered by students as a scholar who paired rigorous argument with spiritual discipline. His writings influenced Islamic law, ethics, theology, and later philosophical debates across the Middle East and beyond.