According to the Wiki of João I, Duke of Bragança:
"After the disaster of the Battle of Ksar El Kebir, where heirless King Sebastian of Portugal died, the aged Cardinal Henry of Portugal had become King. Because Henry was old and was not allowed to have legitimate children, a dynastical crisis occurred even before the death of the Cardinal. The Duke of Braganza supported his wife's claim to the throne (she was a granddaughter of King Manuel I). Philip II of Spain (another grandson of Manuel I and also claimant to the throne), tried to bribe him to abandon his wife's pretensions, offering him the Vice-Kingdom of Brazil, the post of Grand-Master of the Order of Christ, a license to send a personal ship to India every year, and the marriage of his eldest son Teodósio of Braganza to one of his daughters (either Isabella Clara Eugenia or Catherine Michaela). The Duke of Braganza, influenced by his wife, refused the proposal"
What would have happened, however, if João I had accepted Felipe II's proposal? The Braganças abandon their claims to the throne and receive the Hereditary Viceroyalty of Brazil, the position of Grand Master of the Order of Christ, a license to send a personal ship to India every year and the wedding of their eldest son, Teodósio de Bragança, with one of his daughters (either Isabella Clara Eugénia or Catarina Michaela). How would this influence things? considering that Theodosius marries one of Felipe II's daughters, what would that change? In the case of the Braganças receiving the Viceroyalty of Brazil, would they move to Brazil or send a representative while they govern in Portugal?
"After the disaster of the Battle of Ksar El Kebir, where heirless King Sebastian of Portugal died, the aged Cardinal Henry of Portugal had become King. Because Henry was old and was not allowed to have legitimate children, a dynastical crisis occurred even before the death of the Cardinal. The Duke of Braganza supported his wife's claim to the throne (she was a granddaughter of King Manuel I). Philip II of Spain (another grandson of Manuel I and also claimant to the throne), tried to bribe him to abandon his wife's pretensions, offering him the Vice-Kingdom of Brazil, the post of Grand-Master of the Order of Christ, a license to send a personal ship to India every year, and the marriage of his eldest son Teodósio of Braganza to one of his daughters (either Isabella Clara Eugenia or Catherine Michaela). The Duke of Braganza, influenced by his wife, refused the proposal"
What would have happened, however, if João I had accepted Felipe II's proposal? The Braganças abandon their claims to the throne and receive the Hereditary Viceroyalty of Brazil, the position of Grand Master of the Order of Christ, a license to send a personal ship to India every year and the wedding of their eldest son, Teodósio de Bragança, with one of his daughters (either Isabella Clara Eugénia or Catarina Michaela). How would this influence things? considering that Theodosius marries one of Felipe II's daughters, what would that change? In the case of the Braganças receiving the Viceroyalty of Brazil, would they move to Brazil or send a representative while they govern in Portugal?