From c. 1390 to 1857 it was mostly an independent state. From 1857 to 1914 it functioned as a vassal state of the Kingdom of Portugal. In 1914, following the Portuguese suppression of a Kongo revolt, Portugal abolished the titular monarchy. The title of king of Kongo was restored in 1915. The remaining territories of the kingdom were assimilated into the colony of Angola and the Protectorate of Cabinda respectively. The modern-day Bundu dia Kongo sect favors reviving the kingdom through secession from Angola, the Republic of the Congo, the Democratic Republic of the Congo, and Gabon.