In March 1645, a large number of Potiguara people from various regions of north-eastern Brazil gathered in the aldeamento (Indigenous settlements under colonial control or supervision) of Tapesserica on Itamaracá. The primary objectives of the assembly included the establishment of Indigenous câmaras (municipal councils) and deliberations on the law of native freedom. Notably, in this period, some Indigenous people in Brazil were still held as slaves in territories under Dutch jurisdiction. The Tapesserica Assembly produced a remonstrance (‘remonstrantie’), which was delivered to the Dutch government in Recife by the Potiguara. This article scrutinises the Potiguara Assembly, the earliest recorded Indigenous assembly in Brazil, and reconstructs its connections to Indigenous political culture predating the European arrival in Brazil. It explores the Indigenous perspective on the Dutch–Portuguese wars and demonstrates the role of the Potiguara as historical agents, navigating the complexities of conflict and decision-making processes that ultimately shaped their destiny.