Paul I of Russia
Paul remained overshadowed by his mother for most of his life. His reign lasted four years, ending with his assassination by conspirators. He adopted the laws of succession to the Russian throne—rules that lasted until the end of the Romanov dynasty and of the Russian Empire. He also intervened in the French Revolutionary Wars and, toward the end of his reign, added Kartli and Kakheti in Eastern Georgia into the empire which was confirmed by his son and successor Alexander I.
Saint Petersburg
The names of Saints Peter and Paul, bestowed upon original city's citadel and its cathedral (from 1725—a burial vault of Russian emperors) coincidentally were the names of the first two assassinated Russian Emperors, Peter III (1762, supposedly killed in a conspiracy led by his wife, Catherine the Great) and Paul I (1801, Nicholas Zubov and other conspirators who brought to power Alexander I, the son of their victim). The third emperor's assassination took place in Saint Petersburg in 1881 when Alexander II fell victim to narodniki (see the Church of the Savior on Blood).