Isabel Lu%C3%ADsa, Princess of Beira

Infanta Isabel Lusa of Portugal was a Portuguese infanta and the sole daughter of King Peter II of Portugal and his first wife and former sisterinlaw Maria Francisca of Savoy. As such she was styled Princess of Beira. She was the presumptive heir to the throne of Portugal between 1668 and 1689, the year her halfbrother John was born.

Dona Isabel Lusa was the only child of Peter II of Portugal and his first wife the French born Princes Marie Franoise of Savoy. She was born at the Ribeira Palace in 1669.

Source: Wikipedia