King João I was the 5th ManiKongo of the Kingdom of Kongo between 1470 and 1509. After Portuguese sailors visited his kingdom, he voluntarily briefly converted to Catholicism. He was baptised on 3 May 1491 and took the Portuguese Christian name of João. Soon after, ManiKongo Nzinga-a-Nkuwu João I abandoned the new faith in 1495 for a number of reasons, one of them being the 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.