KnowraSebastian of PortugalLinked fromLinked fromThe 9 pages that link to Sebastian of Portugal, each with the reason it gives.All 9Broader topic 3Related 6Iberian UnionRelated: His death without an heir triggered the succession crisis that preceded the union.Kingdom of PortugalRelated: His death without an heir precipitated the succession crisis of 1580.Portuguese succession crisis of 1580Related: His death without an heir opened the succession crisis.Battle of Alcácer QuibirRelated: His decision to lead the expedition placed the Portuguese crown at the center of the battle.John IV of PortugalRelated: The crisis following his death ultimately enabled the Habsburg takeover John overturned.John III of PortugalRelated: John III’s grandson inherited the crown as an infant after his death.