The apparent problem introduced by the lack of nengō for the two periods above is resolved by referencing years of imperial reign.

Peter did however make moustaches a requirement for every soldier excluding officers, and all of the Russian infantry of the imperial reign could be seen sporting them, often growing beyond the upper-lip.

The text is an account of nine imperial reigns.

The imperial reign of Tigranes the Great is thus the span of time during which Armenia itself conquered areas populated by other peoples.

This broke a nearly-thousand-year tradition dating back to Sima Qian of employing annals for imperial reigns but biographies or treatises for other topics.

The apparent problem introduced by the lack of era names was resolved by identifying the years of an imperial reign as a period.

Hundreds of billions of people were about to witness the boldest, and last, reforms of Spock's imperial reign.

Acts were still dated by the imperial reign, but the emperor was of no consequence in regular Neapolitan affairs.

In 565, Emperor Wucheng, believing in astrological signs that the imperial reign would be changed, passed the throne to Gao Wei.

Throughout their imperial reign, the Tiwanaku shared domination of the Middle Horizon with the Wari.