Prince henry

King João I [April 11, 1357 - August 14, 1433] was Portugal's leader in the 1420s. He was the 10th King of Portugal and the Algarves. He reigned from April 6, 1385 until his death 48 years later.

Explorer navigator for Giovanni Da Verrazzano was the first European to see NY and Naraganset bay. This was in the 1420s

As a master of mural painting in Florence (1420s). Works are in Santa Maria Novella and Santa Maria del Carmine.

the first law made in the UK was 1420s or 1400s

Before 1707 the UK did not exist. So the first law that was passed was the Act of union that joined the parliaments of Scotland and England.