Background
Prince Sergei was born on 4 July 1890 in Peterhof, Russian Empire to George Maximilianovich, 6th Duke of Leuchtenberg and Princess Anastasia of Montenegro.
Prince Sergei was born on 4 July 1890 in Peterhof, Russian Empire to George Maximilianovich, 6th Duke of Leuchtenberg and Princess Anastasia of Montenegro.
He succeeded his half-brother Alexander Georgievich as Duke of Leuchtenberg from 1942 until his death. Like his father, Sergei was styled His Imperial Highness from birth. George"s first wife, Duchess Therese Petrovna of Oldenburg, died in 1883, leaving a young son.
George and Anastasia soon married and produced two children, Sergei and Elena.
Sergei died 16 December 1974 in Rome and was buried in the non-Catholic cemetery for foreigners in Testaccio.
He was the last Duke of Leuchtenberg (now living descendants of the Duke of Leuchtenberg are descended from a morganatic marriage, which is why they lost their dynastic status of the members of the Russian Imperial House and the right to the Bavarian ducal title).