Trujillo was one of the first cities in the Americas founded by the Spanish conquistadors. They arrived in an area that had been inhabited and developed for thousands of years by the indigenous peoples. According to historian Napoleón Cieza Burga, the conquistador Diego de Almagro founded the first settlement in November 1534, calling it "Trujillo of New Castile" after Trujillo, the home city of Francisco Pizarro. It was founded among four Chimu settlements: Huanchaco, Huamán, Moche and Mampuesto, to create an alliance against the Incas. On November 23, 1537, King Charles I of Spain gave the town the rank of 'city' and the coat of arms that remains a symbol for the city; it was the first city in Peru to receive a coat of arms from the king. By 1544 Trujillo had around 300 homes and 1,000 inhabitants, and an economy booming from the cultivation of sugar cane, wheat, and other food crops and the raising of livestock.