536: Byzantine General Belisarius enters Rome while the Ostrogothic garrison peacefully leaves the city, returning the old capital to its empire
1212: Frederick II (later also Holy Roman Emperor) crowned King of Germany in Mainz
1968: NLS (a system for which hypertext and the computer mouse were developed) is publicly demonstrated for the first time in San Francisco.
1990: Lech Wałęsa wins Poland’s 1st direct presidential election in Poland
1992: Operation Restore Hope: US Marines land in Somalia