The end of the first quarter of the 17th century saw a new flare-up in Kongo's political struggle. At the heart of the conflict were two noble houses fighting over the kingship. On one side of the conflict was the House of Kwilu, which counted most of the kings named Álvaro. They were ousted by the opposing House of Nsundi, when Pedro II was placed on the throne by powerful local forces in São Salvador, probably as a compromise when Álvaro III died without an heir old enough to rule.