Álvaro I came to the throne during another contest over the throne in 1568. Being from the Kwilu river valley and not a blood relative of any of the previous kings, his reign marked the beginning of the House of Kwilu. There were certainly factions that opposed him, though it is not known specifically who they were. Álvaro immediately had to fight invaders from the east (who some authorities believe were actually rebels within the country, either peasants or discontented nobles from rival factions) called the Jagas. To do this, he decided to enlist the aid of the Portuguese based at São Tomé, who sent an expedition under Francisco de Gouveia Sottomaior to assist. As a part of the same process, Álvaro agreed to allow the Portuguese to establish a colony in his province of Luanda south of his kingdom. In addition to allowing the Portuguese to establish themselves in Luanda, Kongo provided the Portuguese with support in their war against the Kingdom of Ndongo in 1579. The kingdom of Ndongo was located inland east of Luanda and although claimed in Kongo's royal titles as early as 1535, was probably never under a firm Kongo administration.