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.