Regency of Maria Christina of Austria

Maria Christina of Austria was regent of Spain from the death of her husband, Alfonso XII, in November 1885 until their son, Alfonso XIII, turned sixteen and swore the Constitution of 1876 in May 1902. Queen Maria Christina was pregnant when her husband died and gave birth to King Alfonso XIII in May 1886.

Source: Wikipedia — Regency of Maria Christina of Austria (CC BY-SA 4.0)