Tempore

Tempore in historical literature, denotes a period during which a person whose exact lifespan is unknown, was known to have been alive or active, or some other date which is not exactly known, usually given as the reign of a monarch. The word is Latin, being the ablative singular of the noun tempus, temporis, "time", thus meaning "in the time (of)". It should be followed by a name in the genitive... (Wikipedia)