In response, Conan promoted his own legitimate claim as Duke of Normandy over William, as the Catholic Church began preferring legitimate heirs born in church-sanctioned marriage over out-of-wedlock issue.
Vastuseks kuulutas Conan oma seaduslikke õigusi Normandia hertsogi kohale Williami ees, kuna katoliku kirik hakkas eelistama seaduslikke pärijaid, kes sündinud kiriku poolt sanktsioneeritud abieludest, abieluväliste ees.