He was born to a Jewish family in Breslau. In 1904 Spiro was briefly married to the famous actress Tilla Durieux, who later married the important art dealer Paul Cassirer.
Spiro's origins were rooted in a Jewish family in Breslau. In 1904, he formed a short-lived bond with the famous actress Tilla Durieux, who later tied the knot with the notable art dealer Paul Cassirer.