Duke Peter Alexandrovich of Oldenburg (21 November 1868 – 11 March 1924) was the first husband of Grand Duchess Olga Alexandrovna of Russia, the youngest sister of Tsar Nicholas II.

[4] The Dowager Empress Maria Feodorovna wrote to her son, Tsar Nicholas II, "I am sure you won't believe what has happened.

[6] On 9 August 1901, they were married at Saint Petersburg in a grand ceremony attended by family, government ministers, foreign ambassadors, and courtiers.

[10] In the fall of 1901, they traveled on to Biarritz, where a fire at their hotel destroyed many of Oldenburg's uniforms and medals,[11] including a specially-commissioned Danish Order of the Elephant from Fabergé.

[13] On their return to Russia, they moved into a palatial 200-room house at 46 Sergievskaya street, Saint Petersburg, made available to them by the Tsar.

[21] He was thought to be a hypochondriac, had a slender, delicate build, and preferred indoor activities to sports and outdoor pursuits.

[22] He died, aged 55, in 1924 in exile in Antibes, France, and was buried in the crypt of the Russian Orthodox St. Michael the Archangel Church, Cannes.