The VI & last pope to have this name reigned from 1963 to 1978
Reigning only 33 days, the length in 
years ... beloved Pope as Supreme pontiff on June 21st 1963, taking the name of 
the... [DOC] [TLE] CATHOLIC ENCYCLOPEDIA: List of Popes - New Advent [PAR] A complete list of every single pope in the last 2000 years, in chronological order.