Petronille d'Oisy, Abbess of Cysoing, was born circa 1137 to Gautier d'Oisy (-1147) and Ide de Mortagne (c1122-c1169) and died after 1174 of unspecified causes. She married Jan I van Peteghem (c1120-1154) . She married Roger de Landas (-1171) . Notable ancestors include Charlemagne (747-814), Alfred the Great (849-899), Hugh Capet (c940-996). Ancestors are from Germany, France, the United Kingdom, the Netherlands, Belgium.
|Offspring of Petronille d'Oisy and Jan I van Peteghem (c1120-1154)|
|Jean II de Cysoing|| |
|Johanna van Peteghem|| |
|Elisabeth van Peteghem (c1154-c1201)||1154||1201|| Jean I de Nesle (1153-1214)|
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