Juanico de Agreda is known only from his contract of apprenticeship in Zaragoza to Antonio Mayayo The text dated 13 Sept 1583 tells that “Juanico de Agreda, a boy of the Hospital de las Niños Desamparados of the city of Zaragoza, aged ten years more or less, native of the town of Alcolea de Cinca... I sign myself to the magnificent Antonio Mayayo, musician, inhabitant of the city of Zaragoza for eight years... on condition that he will give me to eat, drink... and teach me to read and write, mensural notation, play the vihuela de arco, the vihuela de mano and the harp, and dance....
A larger portion of the document is given in calahorraZ, II, 326.