Annulus Piscatoris
ANNULUS PISCATORIS, an´yu-lus pis-kɑ-tō´ris:
The official ring worn by the popes. Every Roman
Catholic bishop wears a ring, which symbolizes
that he is wedded to his diocese. This custom
dates from very early times, and is mentioned by
Isidore of Seville, who calls the ring signum pontificalis honoris. The ring worn by a pope is engraved with a
representation of St. Peter fishing—whence its special name—and with the title of the
pontiff. From the fifteenth century papal briefs
have been sealed with this ring, and are accordingly
said to be given “under the seal of the fisherman.” At the present time, instead of this seal, an imprint of the same device
in red ink is more commonly used. The ring is given to the newly elected pontiff in the conclave by the cardinal camerlingo,
and is broken on the death of the pope.