Maria died in 1575 but her death was kept secret for fear of a return of the East Frisians. Instead, Jever became one of Oldenburg's territories by last will of Maria. In 1667 Jever was through distaff passed under control of the Anhalt-Zerbst. After Prince Frederick August, who had supported the English in the American Revolutionary War for financial reasons, died in 1793, the male-line of Anhalt-Zerbst perished and its territories were split. Jeverland was then given to Catherine II of Russia, formerly Princess Sophia of Anhalt-Zerbst and Frederick August's sole surviving sibling. It remained Russian until Napoleon's armies occupied it in 1807. Between 1808 and 1810 it was part of the Kingdom of Holland, a Napoleonic vassal state. When the French were forced to withdraw in 1813, Russia regained possession of Jever and gave it to the new grand dukes of Oldenburg in 1818.
https://en.wikipedia.org/wiki/Jever
ПЕРЕСКАЗ МАШИННОГО ПЕРЕВОДА:
После того как принц Фредерик Август, по финансовым причинам поддержавший англичан в американской войне за независимость, в 1793 году умер, мужская линия Ангальт-Цербстских погибла, а его территории были разделены.
Когда французы были вынуждены в 1813 году уйти, Россия получила во владение Йевер и в 1818 году передала его новым великим князьям Ольденбургам.
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Обратите внимание на фразу из ниже приведенного текста: "It remained Russian until Napoleon's armies occupied it in 1807."