The First Crusade siege of Jerusalem, begins on June 7, 1099, during the First Crusade, leading to the capture of the city on June 15 when the Crusaders successfully capturing it from the Fatimid Caliphate and established the Kingdom of Jerusalem, marking the culmination of the First Crusade.
Émile Signol,(1804–1892) Public domain, via Wikimedia Commons. Oil on canvas - 1847.