On 10 November 1509, Pizarro sailed from Spain to the New World with Alonso de Ojeda on an expedition to Uraba. He sailed to Cartagena and joined the fleet of Martin Fernandez de Enciso and, in 1513, accompanied Balboa to the Pacific. In 1514, he found a supporter in Pedro Arias Davila, the Governor of Castilla de Oro and was rewarded for his role in the arrest of Balboa with the positions of mayor and magistrate in Panama City, serving from 1519 to 1523.  Reports of Peru's riches and Cortes's success in Mexico tantalized Pizarro. He undertook two expeditions to conquer the Incan Empire in 1524 and in 1526. Both failed as a result of native hostilities, bad weather and lack of provisions.  Pedro de los Rios, the Governor of Panama, made an effort to recall Pizarro, but the conquistador resisted and remained in the south. In April 1528, he reached northern Peru and found the natives rich with precious metals. This discovery gave Pizarro the motivation to plan a third expedition to conquer the area. He returned to Panama to make arrangements, but the Governor refused to grant permission for the project. Pizarro returned to Spain to appeal directly to King Charles I. His plea was successful and he received not only a license for the proposed expedition, but also authority over any lands conquered during the venture. He was joined by family and friends and the expedition left Panama in 1530.  When hostile natives along the coast threatened the expedition, Pizarro moved inland and founded the first Spanish settlement in Peru, San Miguel de Piura. Atahualpa refused to tolerate a Spanish presence in his lands, but was captured by Pizarro during the Battle of Cajamarca on 16 November 1532. A ransom for the emperor's release was demanded and Atahualpa filled a room with gold, but Pizarro charged him with various crimes and executed him on 26 July 1533, overriding his associates who thought he was overstepping his authority. The same year, Pizarro entered the Inca capital of Cuzco and completed his conquest of Peru. In January 1535, Pizarro founded the city of Lima, a project he considered his greatest achievement. Quarrels between Pizarro and his longtime comrade-in-arms Diego Almagro culminated in the Battle of Las Salinas. Almagro was captured and executed and, on 26 June 1541, his embittered son, Diego de Almagro "el mozo", assassinated Pizarro in Lima. The conquistador of Peru was laid to rest in the Lima Cathedral.

Answer this question "What discovery motivated him?" by extracting the answer from the text above.
In April 1528, he reached northern Peru and found the natives rich with precious metals.