There is a small religious group, which by November 2017 had about twenty members, which is called the Faithful Remnant and believe that they constitute the true Roman Catholic Church. The leader of the group is the Canadian Douglas (Doug) Kuzell who claims that he is the Last Pope, Petrus Romanus. Moreover, Kuzell and his wife, Teresa Jackson (Mary Romanus) claim that they are the Two Witnesses, referred to in the Book of Revelation 11:1-14. My research report on the Two Witnesses was originally written in February 2017, but due to the quite dramatic development, it was updated in February 2018.
The research report is found here: The Faithful Remnant and the Last Canadian Pope