Nzinga-a-Nkuwu João I was the 5th ManiKongo of the Kingdom of Kongo between 1470 and 1509. He voluntarily converted to Roman Catholicism. He was baptized on 3 May 1491 and took the Christian name of João. Soon after, ManiKongo Nzinga-a-Nkuwu João I abandoned the new faith for a number of reasons, one of them being the Roman Catholic Church's requirement of monogamy. Politically, he could not afford to abandon polygamy and embrace monogamy, a cultural shift that the king could not contemplate as power in Kongo was elective, rather than hereditary as in Europe; as Kongo culture followed a matrilineality structure, where the elder son of the king is not automatically the next king.