Master Sargenius (?b - ?d)
Savirien-Chorak, son of Versidue-Shaie, took over the Second Empire after Versidue-Shaie was assassinated. He and all of his heirs were murdered in Sun's Dawn 2E 430 by the Morag Tong, thus ending the reign of the Akaviri Potentates and the Second Empire. Some historians date this event on 2E 431.
Savos Aren was a skilled conjurer and the Arch-Mage of the College of Winterhold, one of the most influential positions any mage can hold in Tamriel. In 4E 201, the Dunmer was well over a hundred years old, having been an apprentice when the Psijic Order pulled their adviser from the College and the Isle of Artaeum disappeared. In his younger years as a student in the College, Aren led a party of five of his friends, all ambitious students at the College, on an exploration of Labyrinthian in the hope of finding hidden treasures and the secrets of Shalidor. However, they underestimated the dangers the ruins held; the exploration went awry and the students died one by one, until Aren and his two remaining companions found themselves in a fight for their lives against a powerful dragon priest. In a last-ditch effort to contain the monster, he cast a spell to enthrall his two companions, trading their lives to trap the monster and save himself. With great shame, Aren fled the Labyrinthian as the sole survivor, sealing the ruin shut and vowing to never let anyone open it. It would haunt his memory for the rest of his days as his greatest, most shameful failure.
Aren became the Arch-Mage sometime after 4E 122, when the Great Collapse destroyed much of Winterhold. During Aren's leadership of the College, he was careful not to anger the already-incensed locals, though he allowed the practice of virtually all forms of magic, only barring some experiments for safety reasons. He also worked to keep the College a completely independent institution, refusing the entreaties of the Synod, the College of Whispers, the Stormcloaks, and the Imperial Legion. While he occasionally shared information when requested, he refused to allow "local politics" to distract from the College's true purpose: the study of magic. For unknown reasons, however, a Thalmor representative, Ancano, became his "advisor". Unfortunately, this would lead to Aren's death. When the College discovered the Eye of Magnus during an excavation of Saarthal and brought it to the College, Ancano attempted to wield its power himself and murdered Aren. Before his death, Savos Aren left behind some final instructions and secrets, where he explained that Labyrinthian held the Staff of Magnus, the key to harnessing the Eye. Aren's successor, guided by Aren's spirit, ventured into the Labyrinthian, finally defeated the dragon priest which had foiled Aren so long ago, and recovered the Staff of Magnus. Aren's successor returned to Winterhold and used it to stop and kill Ancano, saving the College and possibly all of Tamriel.
 Selene, High Priestess of Shagrath (?b - ?d)
A high priestess of the God of Spiders, this powerful sorceress once threatened all of Valenwood with an army of spiders. She was known for consorting with undead, and placed her life force into a jewel named the Heart of Selene. Queen Vlandra of Elden Root had the Eternal Champion retrieve this gem in order to blackmail Selene into calling off her attacks.
 Provisional Governor Senecus Goddkey (?b - ?d)
Septimus Signus was a brilliant scholar from the College of Winterhold who dedicated his life to studying the Elder Scrolls, a pursuit which drove him mad. Eventually, he had trouble even using coherent sentences, and often spoke in verse. He discovered a large Dwemer lockbox in an ice cave north of the College of Winterhold. Somewhere along the way, Septimus became a disciple of Hermaeus Mora, the Daedric prince of the unknown, who led him to believe this lockbox contained the Heart of Lorkhan, compared to which the knowledge of the Elder Scrolls was a mere "passing awareness".
Septimus murdered, sowed dissent, and spread plagues on behalf of the Demon of Knowledge to gain his assistance in acquiring the Heart. But in order to unlock the lockbox, he needed the blood of the Dwemer. With the aid of an assistant, he collected the blood of the various Elven races and used the mixture as a substitute. However, once inside, Septimus did not find the Heart, but rather, the Oghma Infinium, which had been sealed within by persons unknown to deprive Hermaeus Mora of its power. Before Septimus could comprehend that he had been betrayed and used by the daedra, he disintegrated, and Hermaeus Mora's new champion, the assistant, claimed the Oghma Infinium for himself.
 Serana (?b - ?d)
The estranged daughter of Lord Harkon and Valerica. She and her family became Vampire Lords after her father made a deal with Molag Bal and founded the Volkihar clan. When this happened is unclear, but it apparently predated the disappearance of the Dwemer in 1E 700. As a Daughter of Coldharbour, her transformation was unpleasant and emotionally scarring due to Molag Bal's cruel nature. Harkon required her blood or her mother's to power Auriel's Bow to blot out the sun. Valerica hid herself and Serana with the Elder Scrolls to defy Harkon's motives. Eras later when the Dawnguard investigated Dimhollow Crypt, Serana was awakened by the Last Dragonborn and returned to Castle Volkihar. She questioned her father's lust for power and found an ally in the Dovahkiin. The two would travel into the Soul Cairn to reunite with her mother then searched the Forgotten Vale and retrieved Auriel's Bow from the last remaining Snow Elves known to exist. Together, they confronted and slayed Lord Harkon. Serana was then free to live out her immortal life how she saw fit. Some say she eventually sought out a cure for her vampirism.
 Saint Seryn the Merciful (?b - ?d)
Patron of Brewers, Bakers, Distillers. This pure virgin of modest aspect could heal all diseases at the price of taking the disease upon herself. Tough-minded and fearless, she took on the burdens of others, and bore those burdens to an honored old age.
See Mansel Sesnit.
 Archmagus Shalidor (?b - ?d)
Shalidor was an immensely powerful mage, back in the First Era who had an understanding of magic few have ever matched. There are many legends surrounding Shalidor's life such as the legend of how he built the city of Winterhold with a whispered spell, and how he single-handedly fought against the Dwemer legions of clan Rourken at the Battle of Rourken-Shalidor (in which the Spell Breaker is said to have been used). He has also been dubiously credited with the original organization and foundation of the schools of magic as well as the College of Winterhold.
He holed himself up in Labyrinthian, and devoted all of his time to research and study. He is most remembered for his great maze of Labyrinthian, said to hold "Glamoril", or the secret of life which legend holds was stolen from Akatosh by Shalidor.
The Shezarrines are a group of famed heroes and avatars throughout history who are suspected to bear some connection with each other and Lorkhan. They are named after Shezarr, a Cyrodilic version of Lorkhan introduced as a "watered down" version of Shor during the creation of the Eight Divines. The details and purposes of the Shezarrines are as clouded in mystery, confusion, and debate as Lorkhan himself, and hypotheses abound on who or what they represent.
The primary theory (or at least, the one most easily understood) is that each of these immortal champions is an incarnation of Lorkhan, who was separated from his heart and set adrift to wander Mundus, the creation of the Aedra which he helped bring about. The Khajiit believe the Aedra (or possibly the Daedra) cursed Lorkhan for his trickery by tearing out his heart and condemning him to "walk Nirni for many phases". The Redguards believe that Sep, their equivalent of Lorkhan, was created to make the world possible, but his hunger made him a threat to the spirits he was created to protect, so his hunger (the Heart of Lorkhan) was removed, and he was left to "slink around in a dead skin".
 Siddgeir (?b - ?d)
The Imperial-supported Jarl of Falkreath during the Stormcloak Rebellion. He claimed to have deposed his uncle, Dengeir, due to his old age, but Dengeir believed it was actually Imperial machinations. Siddgeir, though, is more lazy than anything and uses his position as Jarl in order to reap lavish benefits. Among the youngest jarls in Skyrim at the time, Siddgeir was very self-involved, and did not trouble himself with the needs of the "smallfolk". He also seemed to lack scruples; he took bribes from local bandits, and then sent agents to wipe them out anyways. He had an amicable attitude towards the Thalmor, believing that a new day had dawned which veterans of the Great War could not recognize. He was also intolerant of worshippers of Talos, believing that they got what they deserved from the Thalmor.
 Silus Vesuius (?b - ?d)
An Imperial destruction mage, citizen of Dawnstar, and curator of the Museum of the Mythic Dawn. He was prompted to open the Museum because his ancestors had been a part of the cult; one of them had even participated in the assassination of Uriel Septim VII. He considered the museum to be their legacy. Of course, the people of Dawnstar despised him and his museum, but he believed that, rightly or wrongly, the Mythic Dawn changed history and deserved study. In 4E 201, it was rumored he was attempting to recollect the pieces of Mehrunes' Razor and reforge the dagger so he could add it to his collection.
 Skakmat (?b - ?d)
Skakmat was Nulfaga's dragon familiar. It reported to her on the happenings in Daggerfall when she retired to Castle Shedungent during the War of Betony. Under Nulfaga's orders, it created a sudden unnatural fog at the Battle of Cryngaine Field which blinded the combatants, providing the cover necessary to allow Gothryd to kill Lysandus' impersonator in a successful attempt to feign the king's death. It is often misconceived that the fog was created by daedric magic, or that it was Nulfaga's attempt to halt the battle.
 Skald Felgeif (?b - ?d)
Nord Jarl of Dawnstar. In 4E 201, he was known as Skald the Elder. When he took the throne over 35 years before, he had been known as Skald the Younger. He was an ardent supporter of the Stormcloaks during the Stormcloak Rebellion. Many of his subjects considered him demanding, foolish, and unpleasant. They often had to seek help elsewhere when they needed a vital task to get done. He had a particular hatred for giants, and without the Empire to stop him, he put forth bounties on their heads.
 The Snow Prince (?b - ?d)
The Snow Prince was a Falmer of great fighting prowess who lived on the island of Solstheim. His kin had great respect for him, and hailed him as their savior in the Battle of the Moesring. The Snow Prince killed many Nords in the battle with his ice magic and his spear, but was struck down by Finna, a twelve-year-old girl, who threw her mother Jofrior's sword at him after she had seen the Prince slay her.
The Nords won the battle, but out of respect and awe they did not burn the body of the Snow Prince with the rest of his kin. Instead, they buried him in a freshly dug barrow, which later became known as Jolgeirr Barrow, along with his steel armor and spear. His body was not encased in Stalhrim as Nordic tradition dictated, but the tomb was lined with treasures worthy of royalty and guards were assigned to protect it. News of his death spread across the land, reaching even the isolated and scattered tribes of Snow Elves across Skyrim.
Sometime before the tomb was abandoned, the guardians became aware of Angria "and her rabble" planning to steal the Snow Prince's steel armor. Heinlen the Heavy's men drove the graverobbers away, although they made off with the ancient helmet. Heinlen tried to warn Winter-Fist, but ended up at the bottom of Lake Fjalding, likely murdered by the thieves. Angria's corpse was found in 3E 427, hanging from the ceiling of her hideout, the Frykte ice cave. In the same year, Jolgeirr Barrow was rediscovered and looted. Fall of the Snow Prince, an ancient account of the Battle of the Moesring taken by Lokheim, was uncovered within and came into the possession of Athellor, an Altmer scholar of the thought-to-be-extinct Falmer. The document was later published and had become popular literature in Cyrodiil by 3E 433, and Skyrim by 4E 201.
 Svaknir (?b - 1E ?d)
Svaknir was a Nord bard in the First Era who became famous (or infamous) for challenging the legitimacy of the capture of the dragon Numinex by Olaf One-Eye. In large part due to his acclaim for capturing Numinex, Olaf had gone on to become High King of Skyrim in 1E 420, ending the War of Succession amongst the Nords. Hence, Svaknir's accusations were highly volatile and controversial.
Svaknir wrote and performed pieces decrying Olaf as a fraud and a tyrant. Olaf responded by imprisoning the bard and destroying every copy of the verse which could be found. Ancient bard texts, perhaps written or inspired by Svaknir, claimed that Olaf and his men came upon a weakened Numinex and captured the dragon without significant effort, and then fabricated the orthodox tale to ensure Olaf's place as Jarl and likely to aid in his bid to become High King. In 4E 201, in an effort to recover King Olaf's Verse, Svaknir's lost portion of the Poetic Edda (a living history of Skyrim maintained by bards), agents from the Bards College reportedly plundered Olaf's tomb and, along with a vengeful shade of Svaknir, fought the draugr that once was the High King of Skyrim. In the end, Olaf considered Svaknir a fool, but respected him as an honest enemy.