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Where did St. Ignatius of Loyola celebrate his first Mass?

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Engraving by Lucas Vorsterman after Peter Paul Rubens showing St. Ignatius of Loyola with a halo, hands clasped in prayer before a crucifix and open book. — St. Ignatius of Loyola Ignatius of Loyola was a Spanish theologian who founded the Society of Jesus (Jesuits) in 1534. The Jesuit order received official papal approval in 1540 and became a key player in the Counter-Reformation of the 16th and 17th centuries.

St. Ignatius of Loyola celebrated his first mass on Christmas Day in 1538 at the Church of St. Mary Major (Santa Maria Maggiore) in Rome.1