List of Counts of Ostfriesland
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List of Counts and Princes of Ostfriesland (East Frisia) from the House of Cirksena:
- 1464-1466: Ulrich I
- 1466-1491: Theda Ukena (widow of Ulrich I)
- 1491-1528: Edzard I the Great
- 1528-1540: Enno II and his brother Johan I
- 1540-1558: Anna of Oldenburg (widow of Enno II)
- 1558-1561: Anna of Oldenburg and her son Edzard II
- 1561-1591: Edzard II and his brother Johan II
- 1591-1599: Edzard II
- 1599-1625: Enno III
- 1625-1628: Rudolf Christian
- 1628-1648: Ulrich II
- 1648-1651: Juliana of Hessen-Darmstadt (widow of Ulrich II)
- 1651-1660: Enno Louis
- 1660-1665: Georg Christian
- 1665-1690: Christine Charlotte of Württemberg (widow of Georg Christian)
- 1690-1708: Christian Everhard
- 1708-1734: Georg Albrecht
- 1734-1744: Charles Edzard
After the death of the last Count of Ostfriesland, the county passed to King Frederick II of Prussia.
