When Columbus arrived in Puerto Rico during his second voyage on November 19, 1493, the island was inhabited by the Taíno. They called it "Borikén", spelled in a variety of ways by different writers of the day. Columbus named the island San Juan Bautista, in honor of St John the Baptist. Having reported the findings of his first travel, Columbus brought with him this time a letter from King Ferdinand empowered by a papal bull that authorized any course of action necessary for the expansion of the Spanish Empire and the Christian faith. Juan Ponce de León, a lieutenant under Columbus, founded the first Spanish settlement, Caparra, on August 8, 1508. He later served as the first governor of the island. Eventually, traders and other maritime visitors came to refer to the entire island as Puerto Rico, and San Juan became the name of the main trading/shipping port.