He was maybe a singer ("mozo de coro") in the Cathedral of Segovia (1578-1579). In 1591 he was chapelmaster in Trujillo (Cáceres) and went to León to participate in the exams ("oposiciones") for the position of chapelmaster of the León Cathedral. Marcos Esteban de Castro was chapelmaster at Ávila Cathedral from December 1603 onwards; he was still working there in 1611, according to Bourligueux (1970), p. 172.
The ascriptions "Leon" in E-V 10 (10r) and "Jº de Leon" in E-V 04 (36v), respectively, probably refer to Jerónimo León, chapelmaster at Valladolid cathedral between 1627 and 1629, but there is no list of works for this composer in the Diccionario (1999-2002). Juan de León (II), a contemporary chapelmaster at Segovia cathedral has sacred and secular production, but these two works ascribed to "León" in Valladolid have not been included in his list of works.