Kammala jumla mai zuwa: Beltrán de la Cueva, duk da haka, an fi saninsa da cewa yana da dangantaka da matar Henry ta biyu, Joan na Portugal. An yi jita-jita cewa ɗan Henry ne kawai, Joan ya haife shi Beltrán kuma ba da Sarki kansa ba, wanda zai iya zama mai rashin ƙarfi. Wannan jita-jita ya kai ga shekaru hudu
Yaƙin Nasara na Castilian, wanda Isabella I, 'yar'uwar Henry ta ci nasara. Yana da wuya cewa yarjejeniya game da yiwuwar mahaifin Joan za a kai ga masana tarihi, kamar yadda babu isasshen shaidar da za ta goyi bayan mahaifin mahaifin da tabbaci. Yawancin kafofin da suka wanzu game da ikon Henry suna da shakku, kamar yadda aka rubuta tarihin sarauta na mulkinsa ko kuma aka sake duba shi a ƙarƙashin tasirin Isabella, wanda sha'awarsa ta sirri a cikin gadon sarauta ya sa ta yi ƙoƙari sosai don nace da rashin bin doka na Joan. Yawancin hankalin Isabella ga Henry, a gaskiya, an kashe shi ne a kan cutar da sunansa don tabbatar da halattacciyar mulkinta. Tambayar mahaifin Joan, a sakamakon haka, ya burge masana tarihi na ƙarni da yawa: idan Joan ba ainihin 'yar Beltran ba ce, kuma a zahiri ta halatta, mulkin Isabella mai matukar tasiri zai kasance cin zarafin doka.