The Battle of Lincoln took place on May 20, 1141, during the Anarchy, a civil war in England between supporters of King Stephen and those of Empress Matilda. The battle occurred near the town of Lincoln, where Matilda's forces, led by her half-brother Robert of Gloucester, sought to capture the city from Stephen's troops. The conflict resulted in a decisive victory for Matilda's forces, leading to the capture of King Stephen. This battle significantly shifted the balance of power in the ongoing struggle for the English throne, highlighting the intense rivalry between the two factions during this tumultuous period in English history.