The Cacaopera people also known as the Matagalpa or Ulúa., are an indigenous people in what is now El Salvador and Nicaragua. The Matagalpa are one of the most important cultures in the historical development of the Nicaraguan territory, but they lack precise information that can legitimize their ethnic origin. Most of the studies carried out on this original group have achieved great advances, but they always remain empty that they do not allow to indicate with certainty said origin. The strongest theory is that which attributes the Matagalpa are of Chibcha origin from South America. Their cultivation of cacao, corn and beans show some Mesoamerican influence. However, historians believe their ceramic style known as "Ceramica Negra" and "Naranja Segovia" show Mayan influence and have been found in abundance in towns near Estelí. According to the archaeologist Edgard Espinosa, Director of the National Museum, the Matagalpa had their highest level of splendor in the ninth century, precisely when the Mayan civilization began to decline and when the Chorotega and Nahua migrations to the Pacific fringe of Nicaragua began. They also built stone statues representing their chieftain and warriors. They were feared by the Spanish because they were very brave and effective with their bows and other arms, which have earned them the nickname "indios flecheros" (archery indians) in Nicaragua. It took 300 years for the Spanish to submit them, even at the time of Nicaragua's Independence in 1821, there were many Matagalpas free in the central mountains of Nicaragua. In 1856 they were decisive to defeat William Walker's filibusters in the Battle of San Jacinto on 14 September 1856, where a column of 60 Matagalpa people with bow and arrows fought at the side of Nicaraguan Patriots winning that battle, which marked the end of Walker adventure in Nicaragua. The "Indios Flecheros de Matagalpa" were declared National Heroes of the Battle of San Jacinto by the Congress of The Republic of Nicaragua. The declaration also includes a statue built in their honor.