Maria II as Maria I; Pedro II as Pedro IV

Pedro I of Brazil was Emperor of Brazil from 1822 to 1831.
Suppose Pedro I does not become King Pedro (Peter) IV of Portugal.
Suppose he is Emperor of Brazil until 1834.
Suppose his daughter Maria does not become Queen Maria II of Portugal. Suppose instead she becomes Empress Maria I of Brazil.
Suppose Pedro II does not become Emperor Pedro II. Suppose instead he goes to Portugal, where he reigns as King Pedro (Peter) IV.
What happens then?
 
well, I suppose there's a lot of problems!

first, you have the problem of a lack of a male heir in Brazil. dunno when Pedro I got his TB (which is what killed him), but if he got it after he left Brazil, his life may be extended. but, if for ease of conversation, you assume a death as OTL, he dies in 34, Maria is 15 at the time of ascension to the throne. She's married in that year to Auguste de Beauharnais, who dies shortly after OTL, but that death, too may be butterflied with a change of venue. Do the Brazilians accept a female ruler? Who ends up regent? Will they accept a foreigner as king?

Pedro II going to Portugal raises all sorts of potential butterflies regarding his marriage (queen of Portugal is a whole lot more palatable than queen of Brazil), and who knows if he ends up with a male heir. You likely still have Miguel attempting to take over, and if Pedro I stays in Brazil, who champions the liberal cause with P2 as just an infant.

And, one of the main reasons Pedro I left Brazil OTL was because he was making enemies/losing control, so he left for greener pastures. If he stays, it's not likely to be all wine and roses. But since Brazil went to hell in a handbasket after he left, can't imagine it going any worse. With the lack of male heir, and no decade of horrible regency making them pine for a king, but with a king they can't get along with, Brazil may decide the monarchy isn't worth continuing. IF they toss the royals, get ready for a republic that is poorly managed, and quite probably balkanizes.
 
The problem is that legally Pedro II could never become king of Portugal, as he was born in Brazil after it became independent, and so he was a Brazilian citizen, and not a Portuguese one. Under the Portuguese succession law, no foreign could become a monarch Portugal. That's why among the children of Pedro I (IV of Portugal) only Maria could be queen, as she was born in Rio de Janeiro in 1819, before the Brazilian indendepence, and therefore she still could be considered a Portuguese citizen.
 
The problem is that legally Pedro II could never become king of Portugal, as he was born in Brazil after it became independent, and so he was a Brazilian citizen, and not a Portuguese one. Under the Portuguese succession law, no foreign could become a monarch Portugal. That's why among the children of Pedro I (IV of Portugal) only Maria could be queen, as she was born in Rio de Janeiro in 1819, before the Brazilian indendepence, and therefore she still could be considered a Portuguese citizen.

The succession law stating the requirement for Portuguese citizens was only enshrined in the Constitutional Charter of 1826, which was briefly superseded by the 1838-1842 constitution (which made no such requirement). Under the ancient (customary) laws of succession of the kingdom, succession was simply by male primogeniture, meaning that foreign princes could inherit the throne. One would simply need to alter the charter or revoke it. This would not be as difficult as this sounds considering Portugal was not too stable politically during his period.
 
The succession law stating the requirement for Portuguese citizens was only enshrined in the Constitutional Charter of 1826, which was briefly superseded by the 1838-1842 constitution (which made no such requirement). Under the ancient (customary) laws of succession of the kingdom, succession was simply by male primogeniture, meaning that foreign princes could inherit the throne. One would simply need to alter the charter or revoke it. This would not be as difficult as this sounds considering Portugal was not too stable politically during his period.

Actually it was already in the Constitution of 1822 (article 143). I agree that the law could be changed, but I think that it's unlikely that Pedro (the father) would send his son to Portugal, or, if he is dead, the Brazilian Parliament would allow Pedro II to become the Portuguese king. They wanted to ensure that the monarchy would be preserved in Brazil, and the prospect of a female succession would undo this (specially if you consider how close the monarchy was to its extinction in 1831).
 
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