His eldest son, Pedro I of Brazil, briefly became Pedro IV of Portugal, but neither the Portuguese nor the Brazilians wanted a unified monarchy; consequently, Pedro abdicated the Portuguese crown in favor of his 7-year-old daughter, Maria da Glória, on the condition that when she came of age she would marry his brother, Miguel.
O seu fillo maior, Pedro I de Brasil converteuse en Pedro IV de Portugal pero nin os portugueses nin os brasileiros querían unha monarquía unificada; consecuentemente, Pedro abdicou a súa coroa portuguesa na súa filla María dá Glória, coa condición de que cando tivese idade suficiente casase co seu irmán Miguel.