0 used in writing before a date to show when a person lived or was active. It is Latin for "he or she flourished". : --
Albert of Aachen floruit circa AD 1100
Her historical identity and floruit are uncertain.
This means his floruit dates a little after 1130.
This would him give a floruit in the late 5th or 6th century.
However, he found the platform to date much later than the accepted floruit of either personage.