Its existence was reported back to Lisbon sometime between then and January 16, 1504, when King Manuel I of Portugal issued a charter granting the "island of St. John" (São João) as a hereditary captaincy to Fernão de Loronha.[16] The date and new name in the charter has presented historians with a puzzle. As Vespucci did not return to Lisbon until September, 1504, the discovery must have been earlier. Historians have hypothesized that a stray ship of the Coelho fleet, under an unknown captain, may have returned to the island (prob. on August 29, 1503, feast day of the beheading of St. John the Baptist) to collect Vespucci, did not find him or anyone else there, and went back to Lisbon by himself with the news.[17] (Vespucci in his letter, claims he left the island August 18, 1503, and upon his arrival in Lisbon a year later, on September 7, 1504, the people of Lisbon were surprised, as they "had been told" (presumably by the earlier captain?) that his ship had been lost.)[18] The captain who returned to Lisbon with the news (and the St. John name) is unknown. (Some have speculated this captain was Loronha himself, the chief financier of this expedition, but that is highly unlikely.)
