Luchesius Modestini, founding member of the Third Order of St. Francis

Luchesius Modestini, TOSF is honored by tradition within the Franciscan Order as being, along with his wife, Buonadonna de' Segni, the first members of the Franciscan Order of Penance, most commonly referred to as the Third Order of St. Francis. He is honored in the Roman Catholic church as a Blessed.

The Third Order of Saint Francis, or Franciscan Tertiaries, is the third order of the Franciscan tradition of Christianity, founded by the medieval Italian Catholic friar Francis of Assisi.