1085 CE
A pivotal year in the Spanish Reconquista as the Christian kingdom of Castile-Leon captured the great city of Toledo from Muslim rule, and William the Conqueror commissioned the Domesday Book survey of England.
The Reconquista
- King Alfonso VI of Castile-Leon captured Toledo on May 25, taking one of the most important cities of Muslim Iberia. Toledo had been the capital of Visigothic Spain and its fall was a major symbolic and strategic victory for the Christian kingdoms.
- The fall of Toledo alarmed the remaining Muslim taifa kingdoms of Iberia, who appealed to the Almoravid dynasty of North Africa for military assistance against the advancing Christian forces.
Governance & Administration
- William the Conqueror ordered the compilation of the Domesday Book, a comprehensive survey of landholding, resources, and population across England, providing an extraordinarily detailed snapshot of the kingdom's wealth and social structure.
Climate & Environment
- Atmospheric carbon dioxide concentration was approximately 275 parts per million, as later confirmed by ice core analysis.
Population & Demographics
- World population is estimated to have been approximately 317 million.