667
Encyclopedia
Year 667 was a common year starting on Friday
Common year starting on Friday
This is the calendar for any common year starting on Friday, January 1 . Examples: Gregorian years 1993, 1999, 2010 and 2021or Julian years 1910 and 1899 ....

 (link will display the full calendar) of the Julian calendar
Julian calendar
The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year .The Julian calendar has a regular year of 365 days divided into 12 months...

. The denomination 667 for this year has been used since the early medieval period, when the Anno Domini
Anno Domini
and Before Christ are designations used to label or number years used with the Julian and Gregorian calendars....

 calendar era
Calendar era
A calendar era is the year numbering system used by a calendar. For example, the Gregorian calendar numbers its years in the Western Christian era . The instant, date, or year from which time is marked is called the epoch of the era...

became the prevalent method in Europe for naming years.
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