Nikolai Kulikovsky

Nikolai Alexandrovich Kulikovsky was the second husband of Grand Duchess Olga Alexandrovna of Russia, the sister of Tsar Nicholas II and daughter of Tsar Alexander III.

He was born into a military landowning family from the south of the Russian Empire, and followed the family tradition by entering the army. In 1903, he was noticed by Grand Duchess Olga during a military review, and they became close friends. Olga wanted to divorce her first husband, Duke Peter Alexandrovich of Oldenburg, and marry Kulikovsky, but neither her husband nor her brother, the Tsar, would allow it.

Source: Wikipedia