VALDUREZO, Ignacio de (val-doo-ray'-tho), Spanish missionary, born in Catalonia in the first half of the 16th century; died in Peru toward the end of that century. He labored for about thirty-five years in the missions of the province of Cochabamba, and learned to decipher the Quipos--necklaces of various colors intermingled with knots of different sizes--which were forinerly used by the Peruvians to record historical events. His manuscript was unfortunately lost, and all that remains is recorded in a letter from Valdurezo to a canon of Charcas, Bartolome Cervantes. The manuscripts of the latter fell afterward into the hands of Anello Oliva, who utilized them in his "Historia del Reyno de Peril." Ferdinand Denis, in his "Etudes sur les Quipos" (Paris, 1858), commends Friar Valdurezo for his discovery.