Mepụta ụdị nkebi ahịrịokwu a dị mgbagwoju anya Blanche nke Lancaster (March 25, 1345 - September 12, 1369 Bolingbroke Castle) Countess nke Derby bụ nwanyị England na onye nketa.
N'ezie, ụdị ahịrịokwu dị mgbagwoju anya bụ "Blanche nke Lancaster (March 25, 1345 - September 12, 1369 Bolingbroke Castle) bụ nwanyị ndị England a ma ama, nwa nwanyị Henry nke Grosmont, 1st Duke nke Lancaster na nwunye ya Isabel de Beaumont. "