1283
Edward I begins Wales's castle ring
The English king commissioned the Savoyard architect James of Saint George to build a chain of stone fortresses around Gwynedd, including Conwy, Caernarfon, and Harlech. Their concentric walls and coastal docks projected Plantagenet authority into a newly conquered province. The castles cost more than any other construction project in medieval England, consuming the equivalent of the crown's entire annual income for several years.
Qalawun signs truce with Crusader Acre
The Mamluk sultan negotiated a ten-year truce with the remnant Kingdom of Jerusalem at Acre, buying time to consolidate his hold on Syria. Both sides knew the truce was temporary. Qalawun used the peace to build the al-Mansuri hospital in Cairo while quietly planning the final siege. Italian merchants in Acre, meanwhile, provoked incidents that would give the Mamluks their pretext to break the truce.
Teutonic Knights complete Prussian conquest
After decades of bloody crusading, the Teutonic Order broke the last Old Prussian resistance. A brother state based at Marienburg rose to rule the Baltic shore, importing German peasants and converting or exterminating pagan tribes. Christianity arrived at the end of a long lance. The Old Prussian language and culture were so thoroughly obliterated that the Prussian name itself was appropriated by the German colonists who replaced them.
Dafydd ap Gruffudd executed at Shrewsbury
The last independent Welsh prince was hanged, drawn, and quartered on Edward I's orders, the first person of high rank to suffer this new punishment for treason. His body parts were displayed in towns across England as warning against rebellion. The gruesome execution established a legal precedent for the punishment of treason that would be invoked against William Wallace and countless others in the centuries that followed.