Justo Gallego Martínez (20 September 1925 – 28 November 2021); also known by his honorific byname Don Justo, was a Spaniard who was known for constructing a church building in the dimensions of a cathedral on his own in the town of Mejorada del Campo since 1961. Most of the construction materials used were recycled or made from "junk". Don Justo dedicated the building to Our Lady of the Pillar (Spanish: Nuestra Señora del Pilar).