Pachacuti places his son, Túpac Inca Yupanqui (or Topa Inca), in charge of the Inca army. Túpac Inca pushes the borders of the Inca Empire to new extremes, heading north into Ecuador after securing vast swathes of central and northern Peru. Túpac Inca's most important conquest was the Kingdom of Chimor, the Inca's only serious rival for the Peruvian coast. Túpac Inca's empire then stretched north into modern-day Ecuador and Colombia. He conquered the province of Antis and subdued the Collas. He imposed rules and taxes, creating two Governor Generals, Suyuyoc Apu, one in Xauxa and the other in Tiahuanacu. Tupac Inca Yupanqui created the fortress Saksaywaman on the high plateau above Cuzco, which included storehouses for provisions and clothing.