 Caxias and Zacarias Góis e Vasconcellos each served three times as President of the Council, while Olinda held the office of Prime Minister for a record of four times.The president of the Council owed his position to both his party's majority in the Legislature (and to his party's willingness to support him in the Chamber) and to the Emperor, and these two sources of authority (parliamentary backing and imperial appointment) could sometimes come into conflict.19th century abolitionist leader and historian Joaquim Nabuco said