Spanish theorist and chapel master, perhaps also a vihuelist, active in Portugal from c.1530. Author of “Tractado de canto llano nueuamente compuesto por Matheo de arãda maestro en musica. Dirigido al muy alto y illustrissimo señor don Afonso cardenal Infante de Portugal. Arçobispo de Lisboa” (Lisbon: German Galhard, 1533). In the dedication to King Joao of Portugal, he describes himself as the Maestro de capilla of the Cathedral of Lisbon. In the prologue he says that he studied speculative music in the University of Alcalá de Henares with Pedro Ciruelo, and practical music in Italy, claiming expertise in both vocal and instrumental music. He is thought to have been organist in Evora and was named Professor of Music in the University of Coimbra on 26 July, 1544. His treatise on plainsong and another “Tratado de musica mensurabile y contrapunto” are listed in the “Catálogo de la Biblioteca Real de Portugal”. Both these works are mentioned, together with an unknown "Arte nuevo para tecla y vihuela" in a letter written by Pedro Aranáz Vives, maestro de capilla in the cathedral of Cuenca in 1790 sent to Juan de Barrio cited by Soriano Fuertes, Fétis y Lacal. Dioubts about the veracity of the keyboard and vihuela book are expressed in Lacal.