The beast of Revelation 13 is identified as the Roman Papacy. (See comments on Revelation 13:1-10.) Does the Pope have a recognized name or title, the numerical value of which fits the description? In Roman Catholic literature (See Ferraris, Prompta Bibliotheca, article "Papa") we find the title, VICARIUS FILII DEI, which is latin for "Vicar of the Son of God." In English this expression is applied to the pope eleven times by Cardinal Manning in his book, The Temporal Sovereignty of the Pope. This title expresses the position the pope claims to possess.
How does one count the number of his name? Before the use of numbers as we have them today, letters of the alphabet were given numerical significance. In ancient heathen cults much thought was given to the preparing of titles which contained a desired numerical value.
You are familiar with Roman numerals, the numbering system used in ancient Rome: