The system of alternating succession broke down in 1764, when Álvaro XI, a Kinlaza, drove out the usurping Kimpanzu king Pedro V (the first to bear this title) and took over the throne. Pedro and his successor in Luvata maintained a separate court at Sembo, and never acknowledged the usurpation. A regent of Pedro's successor claimed the throne in the early 1780s and pressed his claims against a José I, a Kinlaza from the Mbidizi Valley branch of the royal family. José won the showdown, fought at São Salvador in 1781, a massive battle involving 30,000 soldiers on José's side alone. To show his contempt for his defeated rival, José refused to allow the soldiers of the other faction to receive Christian burial. José's power was limited, as he had no sway over the lands controlled by the Kinlaza faction of Lemba and Matari, even though they were technically of the same family, and he did not follow up his victory to extend his authority over the Kimpanzu lands around Luvota. At the same time, the lands around Mount Kibangu, Pedro IV's original base, was controlled—as it had been for the whole eighteenth century—by members of the Água Rosada family, who claimed descent from both the Kimpanzu and Kinlaza.