León, Jerónimo de
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.
Emilio Ros-Fábregas, , Giuseppe Fiorentino, "León, Jerónimo de", Books of Hispanic Polyphony, ed. E. Ros-Fábregas (accession date: 05 Aug 2021), https://hispanicpolyphony.eu/ca/person/13750