Just how exactly was he -- if at all -- related to his wife (Infanta Ana Maria of Portugal)? The reason for my asking is that unlike the Catholic dynasties of Austria and Bavaria, the royal houses of Spain, Portugal, and Italy were not known for marriages with persons of Protestant or Orthodox backgrounds. At least not until the 20th century (e.g. King Alfonso XIII of Spain and Princess Victoria Eugenie of Battenberg, King Juan Carlos and Princess Sophie of Greece). I believe that even France has had her share of interfaith marriages (e.g. Duchess Helena of Mecklenburg-Schwerin).