Conclavism is a term used to describe the beliefs and practices of a small minority of Traditionalist Catholics who reject the generally accepted line of succession to the papacy and instead give their allegiance to alternative popes (or antipopes) whom they have elected themselves. The term comes from the word "conclave", which is used in relation to mainstream Catholic papal elections. Conclavists tend to be strongly opposed by other Traditionalist Catholics, including the sedevacantists with whom they share the belief that the official succession of popes is invalid.