Buuxi weedha soo socota: Sheegashooyinka Isabella ee ku aaddan ma aysan aheyn kuwo ammaan ah, maadaama guursashadeeda Ferdinand ay ka careysiisay walaalkeed Henry IV ee Castile wuxuuna ka laabtay taageeradiisa iyada oo ah dhaxalkiisa dhaxalka ah ee lagu qeexay heshiiskii Bulls of Guisando. Henry wuxuu u aqoonsaday Joanna of Castile, oo dhashay intii uu guursaday Joanna of Portugal, laakiin aabenimadeeda shaki ayaa ka jiray, maadaama Henry la sheegay inuu yahay mid aan awoodin. Markii Henry uu geeriyooday 1474, Isabella waxay sheegatay sheegashadeeda carshiga, taas oo ay ku dooday Joanna oo saddex iyo toban jir ah. Joanna waxay caawimaad ka raadsatay ninkeeda (oo sidoo kale adeer u ahaa), Afonso V ee Portugal, si ay u sheegato carshiga. Khilaafkan u dhexeeya dalabka tartamayaasha ayaa keenay
Dagaalkii 1475-1479. Isabella waxay caawimaad weydiisatay Aragon, iyada oo ninkeeda, dhaxal sugaha, iyo aabihiis, Juan II ee Aragon ay bixiyaan. Inkastoo Aragon ay taageero u fidisay Isabella, taageerayaasheeda waxay ka faa'iideysteen tanaasul, Isabella waxaa loo aqoonsaday inay tahay dhaxalka kaliya ee taajka Castile. Juan II wuxuu dhintay 1479, Ferdinand ayaana ku guuleystay carshiga Janaayo 1479.