Arguin fort established to secure early tradeJan 1, 1448Labels: Arguin Island, Portuguese factoryBritannica
Papal bull Dum Diversas backs Portuguese conquest claimsJun 18, 1452Labels: Pope Nicholas, Dum DiversasDum Diversas
Papal bull Romanus Pontifex grants Guinea privilegesJan 8, 1455Labels: Romanus Pontifex, Papal bullRomanus Pontifex
Death of Henry the Navigator shifts exploration leadershipNov 13, 1460Labels: Henry the, Portugal CrownBritannica
Portuguese reach the Gold Coast trade at ElminaJan 1, 1471Labels: Gold Coast, Elmina regionBritannicaEVE
Treaty of Alcáçovas recognizes Portuguese dominance in GuineaSep 4, 1479Labels: Treaty of, PortugalBritannicaEVE
Bull Aeterni regis reinforces Portugal’s Guinea exclusivityJun 21, 1481Labels: Aeterni regis, Pope SixtusWikisource
Elmina Castle built to protect and centralize gold tradeJan 21, 1482Labels: Elmina Castle, Castelo deBritannicaGMMB
Treaty of Tordesillas reshapes Portuguese-Spanish spheresJun 7, 1494Labels: Treaty of, SpainBritannica
Battle of Three Kings triggers Portuguese succession crisisAug 4, 1578Labels: Battle of, PortugalBritannica
Iberian Union begins, tying Portugal to Spanish crownJan 1, 1580Labels: Iberian Union, Philip IIBritannica
Moroccan victory at Tondibi hastens Songhai collapseMar 13, 1591Labels: Battle of, Songhai EmpireTondibi