It began when King Ferdinand I died without a male heir, and ended when King John I was crowned in 1385 after his victory in the Battle of Aljubarrota.
Hal ini dimulai saat Raja Ferdinand I wafat tanpa seorang pewaris laki-laki, dan berakhir saat Raja Yohnes I dimahkotai pada 1385 setelah ia menang dalam Pertempuran Aljubarrota.