Juan de Salcedo, nephew of Miguel López de Legazpi, was sent up north of Manila. He reached Agoo where he saw Japanese traders and thus called the place Puerto de Japon. He went further up north, and when he saw natives in the area now called City of San Fernando, he asked for tribute to the Queen of Spain. The natives asked to go up the mountains to get what they could give as a tribute but did not come down again. Thus, Juan de Salcedo continued up north and went inside a big river called “Purao”, the Ilocano term which means white, because the river was pristinely white. When he asked tribute from the natives, they refused and so the first battle in the Ilocos ensued. The first Ilocano blood flowed in their refusal to pay tribute to a foreign ruler. The river "Purao" was renamed "Darigayos" for "dara" which is Ilocano for blood and "ayos" which is Ilocano for flowed - and means where blood flowed. The municipality was called "Namacpacan", an Ilocano term that means the place where a battle was fought. Later, the municipality was renamed Luna. Juan de Salcedo then went further up north and was welcomed in a place now called Vigan, which was made an encomienda of the Queen.