The sole recorded research done about the subject was during José Gaspar Rodríguez de Francia's reign after the Independence of Paraguay. This is mentioned by Franz Wisner von Morgenstern, an Austro-Hungarian engineer who served in the Paraguayan armies prior and during the Paraguayan War. According to Von Morgenstern, some Paraguayan miners while working nearby some hills at the Caaguazú Department found some stones with ancient letters carved in them. Dictator Francia sent his finest experts to inspect those stones, and they concluded that the letters carved in those stones were Hebrew-like symbols, but they couldn't translate them nor figure out the exact date when those letters were carved. No further recorded investigations exists, and according to Wisner, people believed that the letters were made by Thomas the Apostle, following the tradition.