Francisco Martín Fernández de Posadas was a 17th-century Spanish Dominican priest and preacher from Córdoba. Born into a family of declining noble status, he faced significant hardship, including a stepfather who attempted to divert him from his religious studies toward an apprenticeship. Despite facing initial hostility and ridicule from members of the Order of Preachers, he entered the novitiate in 1663. He eventually became a highly regarded confessor and preacher, known for his devotion to the sick and imprisoned, and for modeling his life after Saint Vincent Ferrer.