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Daughter of Sjoerd Pybes Wiarda, the fifteenth potestaat (or elected governor) of Friesland and N.N. N.N. Wife of Jarich Wybes Jellama Sister of Oene Sjoerds Wiarda, b. c1378 and Siurt Bearlude Wyaerda
https://www.genealogieonline.nl/stamboom-griffioen-koster/I139640.php