Papa Emeritus is the name taken by the characters who act as the vocalist and spiritual lead for the Swedish doom metal band Ghost (known in the US as “Ghost B.C.”). While his true identity is unknown to all but a few, it is generally assumed that each character is portrayed by the same vocalist due to the similarity of the vocals on each album.
A different incarnation of Papa Emeritus is associated with each album. This Papa, Papa Emeritus II, was active during the Infestissumam era.
A complete record of every iteration of Papa Emeritus can be found here.