Melchor Ferrer Dalmau (1888–1965) was a Spanish historian and a Carlist militant. He is known mostly as principal author of a massive, 30-volume series titled Historia del tradicionalismo español, considered fundamental work of reference for any student of Carlism. Ferrer is recognized also as "periodista" (journalist), chief editor of a national and a few local traditionalist dailies and contributor to a number of others. Politically he maintained a low profile, though periodically he was member of the party executive, and during internal party strife of the early 1960s his support might have tipped the balance in favor of the progressist faction.

Integrism was a Spanish political philosophy of the late 19th and early 20th century. Rooted in ultraconservative Catholic groupings like Neo-Catholics or Carlists, the Integrists represented the most right-wing formation of the Restoration political spectrum. Their vision discarded religious tolerance and embraced a state constructed along strictly Catholic lines; the Integrists opposed Liberalism and parliamentarian system, advocating an accidentalist organic regime. Led first by Ramón Nocedal Romea and then by Juan Olazábal Ramery they were active as a political structure named Partido Católico Nacional, but the group retained influence mostly thanks to an array of periodicals, headed by the Madrid-based El Siglo Futuro. Though Integrism enjoyed some momentum when it formally emerged in the late 1880s, it was soon reduced to a third-rate political force and eventually amalgamated within Carlism in the early 1930s.