Peasants' Revolt: In England, rebels assemble at Blackheath, just outside London.

The Peasants' Revolt, also named Wat Tyler's Rebellion or the Great Rising, was a major uprising across large parts of England in 1381. The revolt had various causes, including the socio-economic and political tensions generated by the Black Death in the 1340s, the high taxes resulting from the conflict with France during the Hundred Years' War, and instability within the local leadership of London. The revolt heavily influenced the course of the Hundred Years' War by deterring later Parliaments from raising additional taxes to pay for military campaigns in France.

The Kingdom of England was a sovereign state on the island of Great Britain from the 10th century, when it was unified from various Anglo-Saxon kingdoms, until 1 May 1707, when it united with Scotland to form the Kingdom of Great Britain, which would later become the United Kingdom. The Kingdom of England was among the most powerful states in Europe during the medieval and early modern periods.

Blackheath is an area in Southeast London, straddling the border of the Royal Borough of Greenwich and the London Borough of Lewisham. Historically within the county of Kent, it is located 1-mile (1.6 km) northeast of Lewisham, 1.5 miles (2.4 km) south of Greenwich and 6.4 miles (10.3 km) southeast of Charing Cross, the traditional centre of London.

June 12 is the 163rd day of the year in the Gregorian calendar; 202 days remain until the end of the year.