His son Hiripan continued the expansion into the area surrounding Lake Cuitzeo. In 1460 the Purépecha State reached the Pacific Coast at Zacatula, advanced into the Toluca Valley, and also, on the northern rim, reached into the present-day state of Guanajuato. In the 15th century, the Purépecha state was at war with the Aztecs. Many Nahua peoples who had lived side by side with Purépecha-speakers were relocated outside of the Tarascan frontiers, and Otomi-speakers fleeing the Aztec expansion resettled on the border between the two polities. That created a fairly homogeneous area of Purépecha speakers, with no other languages spoken in the core area around Lake Pátzcuaro.