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On 27 September 1576, Armgard and Walburgis divided their inheritance: Armgard received Rietberg; Walburgis received the Harlingerland.
Ernest Christopher, Count of Rietberg (1 April 1606 – 31 December 1640) was a member of the house of Cirksena and was Count of Rietberg from 1625 to 1640.
He founded the Catholic side line of the Cirksena in the Westphalian County of Rietberg, the so-called house of East Frisia.
Count Otto III Rietberg (between 1475 and 1485 – 18 December 1535) was Count of Rietberg from 1516 to 1535.
Count Otto IV of Rietberg (d. 5 or 6 January 1553 outside Metz) was Count of Rietberg from 1535 until his death.
Countess Walburgis of Rietberg (1555 or 1556, Rietberg – 26 May 1586, Esens) was 1565-1576 and 1584-1586 Countess of Rietberg.