The name Saint Paulo was dedicated to Saint Paul, serving as the name for the church and school of the French Jesuits. This site was more than a religious venue; it was a knowledge hub permitted by King Narai to disseminate Western sciences. Ancient French documents often refer to this location as one of the most advanced astronomical observatories in 17th-century Asia. The name Saint Paulo thus symbolizes the beginning of modern astronomy and mathematics in Thailand through international relations. Today, the name is still used to commemorate the great collaboration between the Siamese court and European scientists.