Kammala jumla mai zuwa: Saurayi sarki Sebastian I yana ƙonewa da himma don zuwa Maroko da kuma dakatar da ci gaban sojojin da Turkiyya ke tallafawa, wani kamfani wanda ke da alƙawarin ƙarin ƙasa da kudaden shiga a Arewacin Afirka don masarauta (watakila sun yi imanin wannan zai ba su damar kula da fifikon tattalin arzikinsu a kan 'yan kasuwa), amma masu cinikin jari hujja suma sun goyi bayan ƙoƙarin kamar yadda zai amfana da kasuwancin Fotigal a Arewacin Afirka. Sebastian ya yi amfani da yawancin dukiyar daular Portugal don shirya babban rundunar jiragen ruwa da kuma tattara sojoji. An kashe shi da furen masarautar Fotigal a cikin bala'in soja na Yaƙin Alcácer Quibir a 1578, mutuwarsa ta haifar da rikicin nasara, inda manyan masu neman sarauta su ne Philip II na Spain da António, Prior na Crato. Sauran manyan mutanen Fotigal da manyan malamai sun sake haɗuwa da makamai na takwarorinsu masu tunani iri ɗaya, Castilians, kuma sun goyi bayan Philip, jikan mahaifiyar Manuel I na Fotigal. Philip ya aika da rundunar sojoji 40,000 a karkashin jagorancin Duke na Alba don mamaye Portugal. Sun ci sojojin António a
Yaƙin Alcântara da Philip an naɗa shi Philip I na Fotigal a 1581. Ta haka ne aƙalla ya cika burin mahaifinsa, Sarkin Habsburg Carlos I na Spain (kuma Charles V na Daular Roman Mai Tsarki), wanda Friar Nicolau de Oliveira ya ambata: "Se eu fora Rei de Lisboa eu o fora em pouco tempo de todo o mundo" ("Idan na kasance Sarkin Lisbon, da sannu zan yi mulkin duniya duka".) Unionungiyar Portugal da Spain ta ɗauki shekaru sittin (1580<unk>1640).