Sebastián Aguilera de Heredia
We do not know much about his early life. He was ordained as a priest in January 1584. In 1585 he became organist at Huesca Cathedral, where he supervised the building of a new organ at the cathedral during 1588.  In 1603 he became a priest and organist at the Cathedral of La Seo, Zaragossa.  He looked after the organ at the cathedral and often had work done to improve it. He remained at the cathedral until his death on December 16, 1627.