John I (, ]; 11 April 1357 – 14 August 1433) was
King of Portugal and the Algarve in 1385–1433. He was called
the Good (sometimes
the Great) or
of Happy Memory, more rarely and outside Portugal, in Spain,
the Bastard, and was the first to use the title
Lord of Ceuta. He preserved the kingdom's independence from Castile.