also: ていげん
Jōgen era; Teigen era
Japanese era name (nengō) spanning 976–978 CE. The reading じょうげん (Jōgen) is standard; ていげん (Teigen) is an alternate reading.
The Jōgen era is one of the short era names of the mid-Heian period.
This document is dated the second year of the Jōgen era.
Standard kanji form for the era name; reading じょうげん is the primary historical reading.
Alternate reading ていげん is less common; the era is primarily known as Jōgen.
The era name 貞元 (Jōgen) was adopted in 976 CE. The exact derivation is uncertain; it follows the typical pattern of selecting auspicious kanji for era names.