Ta kasa a gwagwarmaya: mai neman da'awar da ya fi karfi shi ne dan uwanta Philip II na Spain wanda yake so ya hada Portugal a cikin haɗin kai tare da sauran masarautun Spain a ƙarƙashinsa. Jam'iyyar 'yan kasa, wadanda ke son Portugal ta kasance mai zaman kanta, sun goyi bayan dan uwanta Anthony na Crato, ba Catherine ba. Anthony ya yi rashin nasara a wasan karshe da Philip a gasar
Yaƙin Alcântara a shekara ta 1580.