Dom Nuno Álvares Pereira, OCarm was a very successful Portuguese general who had a decisive role in the 1383–1385 Crisis that assured Portugal's independence from Castile. He later became a mystic and was beatified by Pope Benedict XV in 1918, and canonised by Pope Benedict XVI in 2009.

The 1383–1385 Portuguese interregnum was a civil war in Portuguese history during which no crowned king of Portugal reigned. The interregnum began when King Ferdinand I died without a male heir and ended when King John I was crowned in 1385 after his victory during the Battle of Aljubarrota.