What title was held by Nicholas II whose eldest daughter was called Grand Duchess of Russia and whose reign saw the fall of the Russian Empire?
Grand Duchess Olga Nikolaevna of Russia: Grand Duchess Olga Nikolaevna of Russia (Olga Nikolaevna Romanova) (Russian: Великая Княжна Ольга Николаевна ; ] (Velikaya Knyazhna Ol'ga Nikolaevna); November 15 [O.S. November 3] 1895 – July 17, 1918) was the eldest daughter of the last Tsar of the Russian Empire, Emperor Nicholas II, and of Empress Alexandra of Russia. Nicholas II of Russia:  His reign saw the fall of the Russian Empire from being one of the foremost great powers of the world to economic and military collapse.
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