Fourth Era 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 shown to the player in the events of and . First Century . 4E 0 – End of the Oblivion Crisis . 4E c . 5 – 6 – Red Mountain erupts , destroying Vvardenfell . 4E 06 – The Argonian s invade southern Morrowind after the eruption of Red Mountain . 4E 10 – Gratian Caerellius dies deep inside an underground mine in Raven Rock . 4E c . 15 – 22 – Ocato , Imperial Potentate since the Elder Council made an unsuccessful bid to select a new Emperor , is assassinated . 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 . 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 . 4E 29 – The Aldmeri Dominion is recreated after Alinor and Valenwood proclaim a union , and all contact is severed with the Empire for 70 years . 4E 42 – The Night of Green Fire occurs in Sentinel ' s refugee district . 4E 49 – Umbriel , a floating city , appears on the coast of Black Marsh , heading toward Morrowind . 4E 98 – The two moons of Nirn , Masser and Secunda , vanish for two years in what becomes known as the Void Nights . Second Century . 4E 100 – The Void Nights end , with the Thalmor taking credit for the return of Nirn ' s moons . 4E 101 — The Isle of Artaeum mysteriously disappears , taking the Psijic Order along with it . In a shocking twist , the Psijic Order retreats back to the Isle of Artaeum , only to completely disappear yet again . However , approximately 100 years later , an apprentice from the College of Winterhold begins seeing visions from members of the Psijic Order , warning them about unavoidable danger ahead . 4E 115 – The Elsweyr Confederacy dissolves due to coup into the two kingdoms of Anequina and Pelletine , which the Aldmeri Dominion accepts as client states . 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 . 4E 168 – Emperor Titus Mede II ascends to the throne . 4E 171 – The Great War begins with armies from the Aldmeri Dominion invading the Imperial provinces of Hammerfell and Cyrodiil . 4E 174 – The Imperial City is sacked by Aldmeri forces . 4E 175 – The Battle of the Red Ring results in the complete destruction of the Aldmeri army in Cyrodiil , a victory for the Empire precipitating the end of the Great War . 4E 175 – The Great War ends with the White - Gold Concordat . 4E 175 – Hammerfell leaves the Empire after rejecting the White - Gold Concordat . 4E 176 – The Markarth Incident takes place . 4E 180 – The Second Treaty of Stros M ' kai is signed . Third Century . 4E 201 – The High King of Skyrim is killed by Ulfric Stormcloak , Jarl of Windhelm . 4E 201 – The Nords of Skyrim engage in a Civil War . 4E 201 – The Dragon Crisis begins .