Question: When is Archduke Joseph August Of Austria's mother's birthday?
Sentence (from "Archduke Joseph August of Austria"): He was a member of the House of Habsburg-Lorraine, the eldest son of Archduke Joseph Karl of Austria (1833–1905) and his wife Princess Clotilde of Saxe-Coburg and Gotha (1846–1927).
Relevant evidence: Yes