John of Ávila was a 16th-century Spanish priest and mystic known for his extensive missionary work in Andalusia. Born in Almodóvar del Campo, he studied law and theology at the universities of Salamanca and Alcalá de Henares. Though he originally intended to serve as a missionary in Mexico, he remained in Spain to revitalize the faith in southern regions. Recognized as a Doctor of the Church, he was a significant influence on the early development of the Jesuits and was celebrated for his powerful preaching and commitment to clerical reform.