Just found a very interesting document. It really gives a new point of view.
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Note: Missions Etrangeres de Paris or The Society of Foreign Missions of Paris (established in 1658) is a Roman Catholic missionary organization. It is not a religious institute, but an organization of secular priests and lay persons dedicated to missionary work in foreign lands.
The Paris Foreign Missions Society started its work in Siam, with the establishment of a base in the capital of Ayutthaya. Siam was known to be highly tolerant of other religions and was the only country in Southeast Asia where the Catholic fathers could establish a base safely. With the agreement of the Siamese King Narai, the Great, the Seminary of Saint Joseph was established, which could educate Asian candidate priests from all the countries of the Southeast Asian peninsula. A cathedral was also constructed. The College remained in Siam for a century, until the conquest of Siam by Burma in 1766.
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