Francisco Guerrero (1528–1599) was a renowned Spanish Renaissance composer and Catholic priest, recognized as one of the “big three” Spanish masters of sacred music alongside Cristóbal de Morales and Tomás Luis de Victoria.
Working primarily in Seville, he was celebrated for his emotionally expressive motets, masses, and, uniquely for his time, significant secular works, often characterized by melodic richness and technical mastery.
This piece was lost as the feast day of St Achacius disappeared in the 1570s, and was abolished as myth in 1969.
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