Illuminato da Rieti was a Catholic priest and an early companion of Francis of Assisi. Born around 1190, he likely hailed from the region near Rieti or Assisi. He participated in the Fifth Crusade alongside Francis, traveling to the court of the Egyptian sultan al-Kamil in 1219. He is notably remembered for being the first individual to observe the stigmata on Francis at La Verna, an event he encouraged the saint to make public.