In 1502, on his fourth voyage, Christopher Columbus became the first European known to have reached what is now Nicaragua as he sailed southeast toward the Isthmus of Panama. Columbus explored the Mosquito Coast on the Atlantic side of Nicaragua but did not encounter any indigenous people. 20 years later, the Spaniards returned to Nicaragua, this time to its southwestern part. The first attempt to conquer Nicaragua was by the conquistador Gil González Dávila, who had arrived in Panama in January 1520. In 1522, González Dávila ventured into the area that later became known as the Rivas Department of Nicaragua. It was there that he encountered an indigenous Nahua tribe led by a chieftain named Macuilmiquiztli, whose name has sometimes been erroneously referred to as "Nicarao" or "Nicaragua". At the time, the tribe's capital city was called Quauhcapolca. González Dávila had brought along two indigenous interpreters who had been taught the Spanish language, and thus he was able to have a discourse with Macuilmiquiztli. After exploring and gathering gold in the fertile western valleys, González Dávila and his men were attacked and driven off by the Chorotega, led by the chieftain Diriangén. The Spanish attempted to convert the tribes to Christianity; the people in Macuilmiquiztli's tribe were baptized, but Diriangén, however, was openly hostile to the Spaniards.