members of a third order (tertius ordo).
I. Secular Tertiaries
Tertiaries are members of a third order for men or women; since the 11th/12th century, they have associated with the male (First Order) or female (Second Order) branch of existing orders, especially the mendicant orders that arose in the 13th century, in order to pursue religious or social goals. The most important was and still is the Franciscan Third Order (Tertius Ordo ¶ Franciscanus, TOF). In his Letter to the Faithful, Francis had l…