The second-eldest daughter of Tsar Peter the Great (), Elizabeth lived through the confused successions of her father's descendants following her half-brother Alexei's death in 1718. The throne first passed to her mother Catherine I of Russia (), then to her nephew Peter II, who died in 1730 and was succeeded by Elizabeth's first cousin Anna. After the brief rule of Anna's infant great-nephew, Ivan VI, Elizabeth seized the throne with the military's support and declared her own nephew, the future Peter III, her heir.