The Fourth Era, also called the Fourth Age, is a period of time on Nirn. The Fourth Era starts with the death of the last emperor and heir to the Septim bloodline, Martin Septim. This era is only shown to the player in the events of The Elder Scrolls V: Skyrim.
- The banishing of Mehrunes Dagon from Tamriel by the Hero of Kvatch, Martin Septim, and the avatar of Akatosh ends the Oblivion Crisis. The Septim bloodline ends and the Amulet of Kings is destroyed. The Third Era ends, marking the beginning of the Fourth.
- The Fourth Era begins with no Emperor on the throne of Tamriel. High Chancellor Ocato, the Elder Council, and the Blades try to maintain order. The provinces start to take advantage of the Empire's weakened state.
- After the destruction of the Crystal Tower during the Oblivion Crisis, the Thalmor begin to rise to political power, having claimed credit for driving back the Daedra. They begin to purge opposition from government.
- Black Marsh secedes from the Empire during the aftermath of the Oblivion Crisis.
- In Vivec's absence, the Ministry of Truth becomes unstable. Vuhon creates an Ingenium that uses souls to stabilize itself. In an effort to free one of the captives used to power it, the Ingenium is destroyed and the rock crashes into the city of Vivec with all the energy it originally had. The impact causes Red Mountain to erupt and destroys the entire island of Vvardenfell, as well as causing massive destruction to the rest of the province.
- Some claim it was incited by the Thalmor, others claim it was a result of the slavery that Morrowind had in the past. In an event known as the Argonian Invasion, a group of Argonians invades and sacks the city of Mournhold, resulting in the deaths of thousands, causing several refugees to flee across Tamriel, most notably Skyrim. Afterwards, the official capital of Morrowind moves west to the city of Blacklight.
- The Stormcrown Interregnum ensues, fracturing the Elder Council and leading to civil war as pretenders attempt to claim the Ruby Throne.
4E 16 - The High King of Skyrim gives the island of Solstheim to Morrowind to help the refugees from the province after the eruption of Red Mountain. 4E 22 — The Thalmor seize control of Summerset Isle and rename it Alinor.
- Taking advantage of Imperial confusion stemming from the Stormcrown Interregnum, the Thalmor overthrow the existing Altmer monarchy, purging non-Altmer as well as dissidents.
4E c. 22-29 — Titus Mede is crowned Emperor after taking the Imperial City.. This source tells us that Titus Mede ends the Stormcrown Interregnum after 7 years. It is likely, however, that he was crowned before 4E 29, as the Thalmor would have needed time to engineer a coup in Valenwood, which likely required knowledge of the Emperor.
- Seven years after the assassination of Potentate Ocato, the Colovian warlord Titus Mede takes the Imperial City by force with only 1,000 men, becoming the new Emperor.
- The union came about after a Thalmor-backed coup overthrew Valenwood's government. The Empire and its Bosmeri allies are caught off-guard and defeated by Altmer forces that invaded Valenwood supported by Bosmeri soldiers following the coup.
- The Khajiit credit the Thalmor as their saviors and Imperial influence in Elsweyr begins to wane dramatically.
4E 122 — The Great Collapse of Winterhold occurs but the College of Winterhold remained untouched. The Sea of Ghosts batters the shore, causing several districts of the city of Winterhold to disappear overnight, devastating it and causing massive damage. In a shocking twist, the College remains unharmed. This led to several controversies, where some people believe that the College caused it themselves, where others believe the College knew about it and chose not to tell or warn anyone. Other people however, believe that the collapse may have been caused by the explosion of Red Mountain, claiming that there were many far-reaching consequences, which could only be felt several years later. Unfortunately, Winterhold never recovered, and the College's reputation was ruined for good.
- The Empire is now a shadow of its former glory. Valenwood and Elsweyr had been ceded to the Thalmor, Black Marsh had been lost to Imperial rule since the Oblivion Crisis, Morrowind had yet to fully recover from the eruption of Red Mountain, and Hammerfell was plagued by infighting between the Crown and Forbear factions. Only High Rock, Cyrodiil, and Skyrim remained prosperous and peaceful.
- The Aldmeri Dominion's invasion force overwhelms Imperial defenses.
- After Titus II rejects an ultimatum to make massive concessions to the Thalmor, Aldmeri armies invade. An army led by Thalmor general Lord Naarifin emerges from hidden camps in northern Elsweyr and assaults southern Cyrodiil, flanking Imperial defenses along the Valenwood border. Leyawiin falls to the invaders, and Bravil is surrounded and besieged. Simultaneously, an army under Lord Arannelya crosses western Cyrodiil, bypassing Anvil and Kvatch and entering Hammerfell. This army is joined by smaller forces landing on Hammerfell's coast. Imperial troops are forced into retreat across the Alik'r Desert.
- Titus II flees north from the city, smashing through the surrounding Aldmeri forces with his main army and linking up with reinforcements heading south from Skyrim under General Jonna. The Imperial City falls to the invaders. The Imperial Palace is burned, White-Gold Tower is looted, and the Aldmeri commit many atrocities against the defenseless populace.
- The Reachmen manage to overthrow the Nords in the Reach and take control of the Hold, due to the Legion garrison being called back to Cyrodiil.
- A combined Cyrodilic-Skyrim army led by Titus II is assembled at Bruma. The army then assaults the Imperial City.
- The Imperial City is retaken and Titus II's decision to withdraw from it the previous year is vindicated. Despite this resounding victory, however, the Empire is exhausted and unable to continue the war. Realizing this, Titus II seeks to negotiate with the Aldmeri Dominion to end the war.
- The Concordat is a peace treaty between the Empire and the Aldmeri Dominion. The terms of treaty gave the Thalmor free reign to stamp out the worship of Talos throughout the Empire, and ceded a large section of southern Hammerfell. Critics note that these terms are almost identical to the ultimatum that Titus II rejected at the start of the war.
- Titus II renounces Hammerfell as a province of the Empire to preserve the treaty after the Redguards oppose ceding their lands. The Redguards see this as a betrayal, and a lasting bitterness between Hammerfell and the Empire is sown to the delight of the Thalmor. Hammerfell continues to war with the Aldmeri Dominion for the next five years.
- Having been fought to a standstill by the Redguards, the Aldmeri Dominion completely withdraws from Hammerfell. The Aldmeri Dominion lost nearly a third of its invasion force during the process. The Imperial lands are left in further ruin and there is political instability. The Aldmeri Dominion further overpower the Imperium in terms of military and economy.
- The Great Reconstruction begins in Cyrodiil, Hammerfell, Valenwood, and Morrowind.
- Ulfric kills the High King Torygg with the Thu'um and proclaims right to the throne, following ancient Nordic custom. 
- Ulfric begins the Stormcloak rebellion in an attempt to take the throne of the High King and secede from the Empire.
- Ulfric is captured and sent to Helgen to be executed along with other rebels and two unrelated prisoners after a surprise ambush led by Imperial General Tullius.
- Ulfric Stormcloak escapes the execution, and resumes the position of the Jarl of Windhelm.
- Before Ulfric was to be executed, the first dragon seen in centuries attacks and destroys the small keep of Helgen, killing mostly everyone defending the keep outside, but leaving a small number of survivors in his wake: Imperial soldiers, Stormcloaks, and an unknown prisoner.
- The Last Dragonborn discovers their power.
- ↑ The Oblivion Crisis
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Rising Threat
- ↑ 3.0 3.1 3.2 Lymdrenn Telvanni's Journal
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 The Great War
- ↑ An Elder Scrolls Novel: The Infernal City
- ↑ The Keepers of the Razor
- ↑ The Elder Scrolls V: Skyrim
- ↑ Dialogue with Hold Guards
- ↑ Dialogue with Ulfric Stormcloak
- ↑ Events of "Unbound"
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