Prince of Monaco Albert I

Monegasque royalty, the Prince of Monaco and Duke of Valentinois from 10 September 1889 until his death on 26 June 1922. He devoted much of his life to the science of oceanography. Alongside his expeditions, Albert I set about making reforms on political, economic and social levels, bestowing a constitution on the Principality in 1911.

He was the son of Prince Charles III (1818–1889), and Countess Antoinette de Mérode-Westerloo (1828–1864).

On 21 September 1869 at the Château de Marchais in Champagne, Prince Albert was married to Lady Mary Victoria Hamilton (1850–1922), of Lanarkshire, Scotland. After the couple's only child (Louis) was born, the couple divorced, and the marriage was annulled on 28 July 1880.

On 10 September 1889, Albert ascended the throne of Monaco on the death of his father. That same year in Paris, on 30 October, he married the Dowager Duchess de Richelieu, née Marie Alice Heine (1858–1925), the American daughter of a New Orleans building contractor of German-Jewish descent. In 1902, they separated legally, without issue, though did not divorce.

Prince Albert I of Monaco died on 26 June 1922 at age 73 in Paris, and was succeeded by his son, Louis II.