King of Portugal and the Algarves: John III
26 January – The Lisbon earthquake and subsequent tsunami resulted in approximately 30,000 deaths.
11 November – Manuel, Prince of Portugal (died 1537)
António, Prior of Crato, King of Portugal as António I of Portugal for 33 days in 1580 (died 1595)
Diogo de Arruda, architect (born before 1490)
María Pacheco, Spanish woman who escaped to Portugal when her husband Juan López de Padilla was killed in 1521 (born about 1496)
1531 in Portugal Wikipedia
Events in the year 1531 in Portugal.