Manuel, Prince Hereditary of Portugal

Manuel of Portugal was the illegitimate son of Antnio, Prior of Crato, pretender to the Portuguese throne during the 1580 Portuguese succession crisis. He secretly married in 1597 Countess Emilia of Nassau, daughter of William the Silent and Anna of Saxony.

Manuel was born in Tangier to Portuguese pretender Antnio, Prior of Crato and one Anna Barbosa. Due to his religious office, Antnio of Crato was not allowed to marry. After a failed attempt to gain the throne in 1580, Antnio used to live in France and England. His son Manuel of Portugal is also known as Emanuel I, in his Dutch context.

Source: Wikipedia