The Queen Mary I of Portugal and her husband Peter III had only 02 sons - Joseph and John- and one daughter - Mariana - who reached adulthood. Joseph, who married his own aunt, died from smallpox in Setember 1788, making his brother John become heir (and the future John VI of Portugal). But WI John had got smallpox and died more or less at the same time as Joseph?
The heir would be Mariana, who was married to Gabriel de Borbón, the fourth son of the Spanish king Charles III. But, if things goes as IOTL, both Gabriel and Mariana died in November 1788, leaving a two-years-old son: Pedro Carlos. So, the legitimate heir of Portugal would be an infant Spanish Bourbon.
How it could have changed the Iberian history? Portugal's policies would probably be much closer to Spain, and maybe there wouldn't be the war of 1801. And, if things goes in France more or less like OTL, and Spain still becomes a French ally, Portugal - tied with Spain - could have broken the alliance with Britain, so no need of a French invasion in 1807.
Any other ideas of possible consequences of a Bourbon on the Portuguese throne?
The heir would be Mariana, who was married to Gabriel de Borbón, the fourth son of the Spanish king Charles III. But, if things goes as IOTL, both Gabriel and Mariana died in November 1788, leaving a two-years-old son: Pedro Carlos. So, the legitimate heir of Portugal would be an infant Spanish Bourbon.
How it could have changed the Iberian history? Portugal's policies would probably be much closer to Spain, and maybe there wouldn't be the war of 1801. And, if things goes in France more or less like OTL, and Spain still becomes a French ally, Portugal - tied with Spain - could have broken the alliance with Britain, so no need of a French invasion in 1807.
Any other ideas of possible consequences of a Bourbon on the Portuguese throne?