He was born Ludwig Josef ltid'l!I· Johann Wittgenstein on 26 . T I April 1889, the eighth and · · -~;1 youngest child of one of ~~ the wealthiest families in Hapsburg Vienna. His father Karl (1847-1913) was of Jewish descent (Karl's father had converted to Protestantism). His mother Lepoldine Kalmus (1850-1926), known as "Poldy", was a Catholic. Ludwig was baptized in the Catholic Church.