1039
Ibn al-Haytham dies in Cairo
The Basran mathematician and physicist died in his Fatimid house at about seventy-five years old. His Book of Optics, rigorously experimental, would be translated into Latin in the twelfth century and shape the understanding of vision and refraction from Roger Bacon to Kepler four centuries later. His insistence on verifiable experiment over inherited authority made him a forerunner of the scientific method itself.
Death of Conrad II
The Salian emperor who had added Burgundy to the empire and restored imperial authority in Italy died at Utrecht. He was buried at Speyer Cathedral, which he had begun building on a scale that still stuns visitors today. His son Henry III succeeded him without dispute, inheriting a formidable position.
Song-Xia War erupts on the northwest frontier
Li Yuanhao's newly proclaimed Western Xia empire clashed with Song border forces in a series of costly frontier battles. The Tangut cavalry inflicted humiliating defeats on Chinese armies at Haoshuichuan and elsewhere, exposing the military weakness that lurked beneath the Song's commercial brilliance. The war drained the treasury and fueled calls for reform at court.
Ghana Empire controls Audaghost trade hub
The Soninke rulers of Ghana extended their authority over the Saharan trading town of Audaghost, previously held by Sanhaja Berbers. The town sat at the junction of caravan routes linking West African gold to North African markets. Its capture demonstrated Ghana's capacity to project power deep into the desert and extract tribute from the trans-Saharan trade.