Their closeness ended with Nicholas ' ascension to the throne and marriage .
During the last year of Tsar Alexander III 's reign , Sergei and his brothers Alexander and George Mikhailovich were constant companions of the future Tsar , Nicholas II .
Their closeness ended with Nicholas II ' ascension to the throne and marriage .
During the last year of Tsar Alexander III 's reign , Sergei and his brothers Alexander and George Mikhailovich were constant companions of the future Tsar , Nicholas II .