Downfall
On 28 December 1833, shortly after the death of Ferdinand VII, Maria Christina secretly married an ex-sergeant from the royal guard, Agustín Fernando Muñoz (1808–1873). Maria Christina and Muñoz had several children together while trying to keep their marriage a secret.
Maria de los Desamparados, Countess of Vista Alegre (17 November 1834 - 19 August 1864); married Prince Władysław Czartoryski (1828–1894).
Maria de los Milagros, Marchioness of Castillejo (8 November 1835 – 9 July 1903); married Prince Filippo Massimiliano Del Drago of Mazzano and Antuni (1824–1913). Their fourth son Giovanni Battista was known as the Prince del Drago in New York society.
Agustín Maria, 1st Duke of Tarancón (15 March 1837 - 15 July 1855)
Fernando Maria, 2nd Duke of Riansares and Tarancon (27 April 1838 – 7 December 1910); married Eladia Bernaldo de Quirós y González de Cienfuegos (1839–1909).
Maria Cristina, Marchioness of La Isabella (19 April 1840 – 19 December 1921).
Juan Bautista, Count of Recuerdo (29 August 1841 – 2 April 1863)
Antonio Muñoz y de Borbón (3 November 1842 – 1847)
Jose Maria, Count of Gracia (21 December 1843 – 17 December 1863)
Muñoz enlisted in the royal bodyguard, and attracted the attention of Maria Christina. According to one account, he distinguished himself by stopping the runaway horses of her carriage; according to another, he only picked up her handkerchief; a third, scandalous explanation of his fortune has been given. Maria Christina's husband, King Ferdinand VII of Spain died on 29 September 1833, and on 28 December 1833 she and Muñoz were privately married.
If Maria Christina had officially made the marriage public, she would have forfeited the regency; but her relations with Muñoz were perfectly well known within the Spanish court. When on 13 August 1836 the soldiers on duty at the La Granja summer palace mutinied and forced the regent to grant a constitution, it was generally, though wrongly, believed that they overcame her reluctance by seizing Muñoz, whom they called her guapo, or fancy man, and threatening to shoot him.
Eventually, news of Maria Christina's marriage to this low-ranking soldier became public. That news made Maria Christina deeply unpopular. Her position was undermined by news of her remarriage and concerns that she was not actually supportive of her liberal ministers and their policies. Eventually, the army, which was the backbone of Isabella II's support, and the liberal leadership in the Cortes combined to demand that Maria Christina stand aside from the regency. In 1840 Maria Christina found her position intolerable; she renounced the regency and left Spain with Muñoz. The army commander, General Baldomero Espartero, replaced her as regent.