A history of the Society of Wandering Brothers, the Fratres Peregrinantes, a suborder of the Dominicans devoted to missionary work in the medieval Near East, and beyond. This book exhaustively lists what can be known about this order, founded about 1300, which sponsored missions in Greece, Turkey, Persia, India and, briefly, China; this book its struggles with schismatic Greeks, with rival Franciscans, with Muslims and pagans - and the bureaucratic infighting within the Dominicans. Of especial interest are its missions to the Tartars of South Russia, frequently ending in martyrdom, and the mssion to Armenia, which resulted in a native Armenian movement for ecclesiastical Union between Armenia and Rome. After the Black Death, its surviving missions were folded into the larger Dominican order, but but it was revived repeatedly down to its final suppression in 1857, including the fifteenth century mission to Eastern Europe from Lithuania to the Danube.