This bulla has the name of Pope Celestine III on the verso. He was elected Pope in 1191 and continued until 1198.
Obverse: Heads of the apostles Peter and Paul, the founders of the Church of Rome with SPASPE (Sanctus PAulus and Sanctus PEtrus) above
Reverse: ELIE STMVS PI III
The reverse (verso) of the bulla shows the name of the Pope, which is written in the nominative, with his abbreviated title. It reads ‘CELE / STINVS / PP • III’ within a beaded border. The ‘PP’ has an ‘Ω’ above.
About.com/library/who/blwwpopelist.htm…
Newadvent.org/cathen/12272b.htm

So far I cannot find the pope’s name on the complete popes list links above.
If you can help please add your comments below…

Weight: 44.13 g
Size: 38.73