Succession to the Spanish throne follows male-preference cognatic primogeniture. A dynast who marries against the express prohibition of the monarch and the Cortes Generales, the legislative chamber of Spain, is excluded from the succession. Upon proclamation by the Cortes Generales, the monarch is to take an oath to discharge his duties faithfully, to abide by the Constitution and the law and ensure they are abided by, and to respect the rights of the citizens and of the Autonomous Communities. Line of succession The historical list of potential successors with dynastic rights is much longer, but the 1978 Constitution of Spain limits the succession to heirs of King Juan Carlos I. King Juan Carlos I (born 1938) King Felipe VI (b. 1968) (1) Leonor, Princess of Asturias (b. 2005) (2) Infanta Sofía of Spain (b. 2007) (3) Infanta Elena, Duchess of Lugo (b. 1963) (4) Don Felipe de Marichalar y Borbón, Lord of Tejada (b. 1998) (5) Doña Victoria de Marichalar y Borbón, Lady of Tejada (b. 2000) (6) Infanta Cristina of Spain (b. 1965) (7) Don Juan Urdangarin y Borbón (b. 1999) (8) Don Pablo Urdangarin y Borbón (b. 2000) (9) Don Miguel Urdangarin y Borbón (b. 2002) (10) Doña Irene Urdangarin y Borbón (b. 2005) Succession uncertainties Section 1 of Article 57 of the 1978 Constitution of Spain provides that The Crown of Spain is hereditary to the "sucesores" of His Majesty Don Juan Carlos I de Borbón. To date, no clarification has been made whether this provision includes anyone beyond the direct descendants of King Juan Carlos. Successors may not be presumed to be synonymous with descendants. Section 3 of Article 57 further states that should all the lines designated by law become extinct, the Cortes Generales shall provide for succession to the Crown in the manner most suitable for the interests of Spain. Infanta Pilar, Duchess of Badajoz and Infanta Margarita, Duchess of Soria, sisters of King Juan Carlos, respectively renounced their rights to the succession upon marriage but before the adoption of the Constitution. Similarly, the rights of earlier generations are clouded by renunciations and unapproved marriages which may or may not exclude them from succession. Section 5 of Article 57 provides that abdications and renunciations and any doubt in fact or in law that may arise in relation to the succession of the Crown shall be settled by an organic act. Unless and until one