Olga Constantinovna of Russia

Born into the Romanov dynasty on 3 September 1851, Olga Constantinovna was the oldest daughter of Grand Duke Constantine Nikolaievich and grew up between Saint Petersburg, Congress Poland, and the Crimea. She married King George I of Greece in 1867 at sixteen, initially uneasy in her new kingdom but soon channeling her energy into social work - building hospitals and schools, though her push for a more accessible Greek translation of the Gospels provoked riots from religious conservatives. After George's assassination in 1913, she returned to Russia and ran a military hospital in her brother's Pavlovsk Palace during the First World War, only to be trapped there by the 1917 Revolution until the Danish embassy secured her escape to Switzerland. She came back to Athens in October 1920 as her grandson King Alexander lay dying, served briefly as regent that November until Constantine I's restoration the next month, then went into exile again after Greece's defeat in the Greco-Turkish War. She spent her final years moving between the United Kingdom, France, and Italy, dying on 18 June 1926.