Albert II, Duke of Brunswick-Lüneburg (German: Albrecht II., Herzog zu Braunschweig-Lüneburg; 1 November 1419 – 15 August 1485), was a Prince of Grubenhagen; he reigned from 1440 until his death in 1485.
After 1440, the three brothers, following the Grubenhagen tradition, ruled jointly until Henry died in 1464.
For example, in 1477, Duke William IV the Younger of Göttingen got into a dispute with the city of Einbeck (in the Duchy of Grubenhagen) and in 1479, he encamped his army before the town.
According to the chroniclers, more than 300 citizens were killed and over 800 were captured and brought to William's Hardegsen Castle.
The city of Einbeck, however, had to pay a ransom of 30000guilders to free the captive citizens, and had to accept William's protection.