Francisco Javier de Istúriz y Montero (31 October 1785 in Cádiz – 2 April 1871 in Madrid) was a Spanish politician and diplomat who served as the Prime Minister of Spain. He also served as the President of the Senate and President of the Congress of Deputies several times.

Personal life Istúriz y Montero was a Freemason and operated a Masonic Lodge known as "El Pireo" out of his own home, where he was known by the name of "Brother Sagunto." Retrieved on 9 November 2023. Retrieved on 9 November 2023. He was associated with the Gran Oriente de España (GOdE).

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