massacre in front of the Reichstag on 13 January 1920
1920 CE.
Shown on the map at 52.519°, 13.376°.
The Reichstag Bloodbath (German: Blutbad vor dem Reichstag) occurred on 13 January 1920 in front of the Reichstag building in Berlin during negotiation by the Weimar National Assembly on the Works Councils Act (Betriebsrätegesetz). The number of people killed and injured is controversial, but it is certainly the bloodiest demonstration in German history. The event was a historic event that was overshadowed two months later by the Kapp Putsch but remained in Berlin's labour movement and security forces' collective memory.
Text from the Wikipedia article Reichstag Bloodbath, licensed CC BY-SA 4.0.