At this time the Spanish were still unaware of the death of the previous Sapa Inca (Titu Cusi) and had routinely sent two ambassadors to continue ongoing negotiations being held with Titu Cusi. They were both killed on the border by an Inca captain. Using the justification that the Incas had "broken the inviolate law observed by all nations of the world regarding ambassadors" the new Viceroy, Francisco de Toledo, Count of Oropesa, decided to attack and conquer Vilcabamba.