Orazio Ludovisi (July 1561 – 2-30 November 1624) was an Italian nobleman, military commander and patrician of Bologna.
During his brother's reign as Pope Gregory XV, he became Commander of the Papal Armies, Roman Noble and 1st Duke of Fiano and Zagarolo.
[5] A month later, on 13 March 1621, Ludovisi moved to Rome and was immediately appointed General of the Roman Catholic Church and Commander of the Papal Armies by his brother.
Setting a precedent for his successor (Pope Urban VIII, who would later make habit commonplace), the Pope also purchased the comune of Fiano from the House of Sforza[6] for 200,000 Écu[7] and Ludovisi was duly appointed Duke of Fiano and also Duke of Zagarolo.
During his brother's reign, Ludovisi and his wife were patrons of the Bolognese painter Giovanni Valesio.