Noun
floruit (plural floruits)
The time period during which a person, group, culture, etc. is at its peak.
Synonym: flowering
His dates of birth and death are based on a life span of 60 years, the age at which Diogenes says he died, Diogenes Laërtius, ix. 3 with the floruit in the middle. Source: Internet
Other dated inscriptions are used to determine a floruit for GDRT (interpreted as representing a Ge'ez name such as Gadarat, Gedur, or Gedara) around the beginning of the 3rd century. Source: Internet