Ibn al-Khatib

Lisan al-Din ibn al-Khatib was born in 1313 CE in Loja, a town in the Kingdom of Granada in Andalusia, Spain. He came from a distinguished family and received a thorough education in medicine, law, history, philosophy, and literature in Granada. He became the chief minister (vizier) of the Nasrid sultanate of Granada, serving Sultan Muhammad V with remarkable administrative skill while simultaneously pursuing a prolific literary and scientific career.

Ibn al-Khatib lived through the catastrophic Black Death pandemic of 1347–1348 CE, which devastated Europe and the Islamic world. Unlike most contemporaries who attributed the plague to divine punishment, astrological configurations, or miasmic air, Ibn al-Khatib made careful empirical observations. He noted that plague spread through clothing, vessels, earrings, and contact with the sick, while isolated individuals who had no contact with infected persons remained healthy. He also noted that the disease was introduced to new regions by travelers.

In his treatise Tahqiq al-Naba' 'an Amr al-Waba' (Investigating the Report Concerning the Plague), he formulated what amounts to an early germ theory, arguing that the plague was transmitted through contaminated particles that passed from body to body — predating germ theory as formally established by Pasteur and Koch by over five centuries. His conclusions directly challenged religious authorities who opposed the concept of contagion.

Beyond medicine, Ibn al-Khatib was one of the greatest historians and literary figures of medieval Andalusia, authoring the encyclopedic Ihata fi Akhbar Gharnata (The Encompassing Work on the History of Granada). Political intrigue led to his imprisonment and execution in Fez in 1374 CE. He remains one of the towering intellects of the Islamic Golden Age.