Francisco Javier de Istúriz y Montero (31 October 1785 in Cádiz[5] – 2 April 1871 in Madrid[6]) was a Spanish politician and diplomat who served as the Prime Minister of Spain.

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.

"[8][9] He was associated with the Gran Oriente de España (GOdE).

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