Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla Blanche na Lancaster (Maris 25, 1345 - Satumba 12, 1369 Bolingbroke Castle) Countess na Derby ya kasance dan Ingila mai daraja da magaji.
Tabbas, mafi rikitarwa na jumla shine "Blanche na Lancaster (25 ga Maris, 1345 - 12 ga Satumba, 1369 Bolingbroke Castle) wata mace ce ta Ingila, 'yar Henry na Grosmont, 1st Duke na Lancaster da matarsa Isabel de Beaumont. "