A região leste do Vale Nibenay e os Estados Colovianos do oeste desenvolveram culturas distintas, mas ainda ficaram unidos sob {{Lore Link|Reman I}} para repelir uma avasão {{Akavir}}i em {{Year|1E 2703}}, criando o {{Lore Link|Segundo Império}}.{{ref|name=PGE3C}}{{ref|name=PGE1C}} Os Akaviri devastaram muitas terras humanas, e Reman temeu a invasão de {{Lore Link|Ilhas do Semprestio}}, então ele permitiu que os Akaviri remanescentes sobrevivessem para viver e lutar por ele contra os Elfos.{{ref|name=PGE1C}} Logo o Segundo Império controlava todas as províncias de Tamriel com exceção de Brisavinda.

{{ref|name=PGE1C}} Os eventos acerca da tentativa de conquista de Brisavinda levou ao fim dos imperadores Reman, e da Primeira Era, em {{Year|2920}}:

The {{Lore Link|Akaviri Potentate}}s would rule until {{Year|2E 430}}, but eventually assassinations and poor leadership would make the Empire crumble, leading to the {{Lore Link|Interregnum}}: for four hundred years, petty states all over Tamriel quarreled with each other, especially Cyrodiil.{{ref|name=PGE3C}}{{ref|name=PGE3AS|{{Cite book|PGE|3|Arena Supermundus}}}} The Imperial Province devolved into a collection of warlords squabbling over a no-man's land of cultural stagnation.{{ref|name=PGE3C}}{{ref|name=DHAC|{{Cite book|Dwemer History and Culture}}}} Ironically, it would take a {{Lore Link|Nord}} to reunite the Imperial Province: Tiber Septim was appointed general of the forces of {{Lore Link|Cuhlecain}}, a petty Colovian king. He routed all of Cuhlecain's enemies who would face him and his armies on the battlefield, quickly reuniting Cyrodiil. When Cuhlecain was assassinated in {{Year|2E 854}}, Tiber Septim assumed the throne.{{ref|name=PGE1C}} In a few decades, the provinces would be reunited once more under his {{Lore Link|Third Empire}}, and this outsider to Cyrodiil had become the symbol of the whole realm.{{ref|name=PGE3C}}