Waihangahia he putanga matatini ake o tenei rerenga Blanche o Lancaster (25 o Maehe, 1345 - 12 o Hepetema, 1369 Bolingbroke Castle) Ko te Countess o Derby he wahine rangatira Ingarihi me te rangatira.
Ko te tikanga, he putanga matatini ake o te rerenga korero ko "Ko Blanche o Lancaster (25 Poutu-te-rangi 1345 - Hepetema 12, 1369 Bolingbroke Castle) he wahine rangatira Ingarihi, tamahine a Henry o Grosmont, 1st Duke o Lancaster me tana wahine a Isabel de Beaumont. "