Empress Hestra ruled in Tamriel during the First Era, circa 1E 1029. That year, she expanded the Alessian Empire, admitting High Rock as a province after she defeated King Styriche, the Vampire of Verkarth with the aid of the Bangkorai Garrison. When the Empress Hestra led her legions in harrying the Vampire King and his Gray Host into western Hammerfell, it's said she did so while riding a great Flame Atronach Bear Mount named Fiery Ursula.
During her reign, pirates and brigands used the swampland of Black Marsh as a base for launching attacks on merchants off the southeastern coast of Tamriel. She instigated an aggressive anti-piracy campaign in 1E 1033 that eventually led to the capture of the most infamous pirate, "Red" Bramman. Around the same time as the anti-piracy campaign, Hestra's forces worked to bring the Reach under their heel. While many of the various kings in the region surrendered, rebel holdouts still inflicted heavy losses. Hestra is also known to have improved the road system of her empire, an endeavor continued by the Reman emperors in later centuries.
A powerful class of runestone was apparently named after the empress: "Hestra" stones are found in Cyrodiil, and grant the person who activates them a piece of armor and a weapon for a short period of time. Notably, another series of stones are named after Emperor Reman. One theory for the origin of these stones is that they were devised and placed by the rulers whose names they bear, while another posits that the stones were created much earlier and only moved into their current positions by the rulers. In addition to being associated with these runestones, Hestra has at least one famous enchanted item associated with her: a Gown of State reputed to be able to repel inimical spells, stave off fatigue and enable levitation at will.
- "Herda" is accredited with improving relations with the Colovian West.
- Her soul bound to the Amulet of Kings, Hestra witnessed the Dragon Break caused by the Alessian Order and afterwards reported that Cyrodiil became an "Empire across the stars".
- After her conquering of High Rock, Empress Hestra made the nobles of House Montclair barons, a position they maintained for many years.
- Pocket Guide to the Empire, 3rd Edition: The War with the Trees: Argonia and the Black Marsh — Imperial Geographical Society, 3E 432
- The Bretons: Mongrels or Paragons? — Phrastus of Elinhir
- Bangkorai, Shield of High Rock — King Eamond
- Chancellor Abnur Tharn Answers Your Questions 2 — Chancellor Abnur Tharn
- Description of Flame Atronach Bear Mount in ESO
- The Legend of Red Eagle — Tredayn Dren
- Lost Legends — Talsgar the Elder, Archivist of Winterhold
- Lectures at Arcane University during the events of TES IV: Oblivion.
- Lady Eloisse Answers Your Questions — Lady Eloisse, Fifth Countess Manteau
- Pocket Guide to the Empire, 3rd Edition: The Wilds Remain: Valenwood — Imperial Geographical Society, 3E 432
- Where Were You ... Dragon Broke — Various