All times in UTC ·
Dashed edge = started before, or continues beyond, this day
Events on Monday 18 September 1939 1
1885 – 1939Stanisław Ignacy Witkiewicz (1885-1939)Died 18 September 1939, aged 54Witkacy was a Polish playwright, painter, novelist and philosopher and one of the major figures of the interwar avant-garde. He fled east after the German invasion. He took his own life on hearing of the Soviet invasion.