The Resurgence of Civilizations is a historical time span in which most of the modern civilizations started emerging after the cataclysms and wars that preceded it. The most important civilizations that emerged during this time were 
Noxus, 
Demacia, 
Piltover and 
Bilgewater.
History
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Noxus was founded, and within it, the Noxian capital: Noxus Prime, was built on top of the derelict Immortal Bastion. This event marks the beginning of the Noxian Calendar.
Demacia was founded in western Valoran by the great champion Orlon. 
Poppy receives the 
Hammer of Orlon on Orlon's Deathbed.
Kayle and 
Morgana received their mother's 
Starfire Spellblade and unlocked their innate celestial power; together, they protected Demacia.
Kayle and Morgana flew to aid the people of Zeffira. While Kayle was busy dealing with the frontline attack, Morgana learned of a hidden wave of enemies attacking the city and left the frontlines to aid the citizens. Kayle lost trust in her sister for leaving her on the battlefield.
Warriors flocked to Kayle's banner at Silvermere's Peak, where she founded a judicator order to enforce the law, and hunted down rebels and reavers with equal fervor. Kayle allowed Morgana to rehabilitate wrongdoers who appeared humble enough to admit their guilt. But gradually Kayle's followers started to resent Morgana. Kayle's protégé, Ronas, attempted to imprison Morgana for her actions, which resulted in his death.
Kayle, consumed by rage, looked down upon the city and summoned her divine fire to cleanse it of its sins. Morgana flew up to meet her, raising her blade to defend the innocent below. The battle raged on, ruining the city and killing numerous of its inhabitants, until it was abruptly halted by their father's anguished cry.
With the death of their father Kilam, both Kayle and Morgana left Demacia. Kayle isolated herself near the slopes of Mount Targon, seeking perfect celestial clarity. Morgana remained at the outlying wilds of Demacia where she rectifies wrongs as she sees fit on an interpersonal level as 'the Veiled One'.
The true identity of the twin sisters and their history was forgotten, and the Kingdom of Demacia is established with the first Demacian royal family. Without knowing or fully understanding its origins, the Demacians take on the symbol of the Winged Sisters as their crest.
- 292 AN - 349 AN
Noxus starts to forcefully annex numerous territories alongside its eastern borders, one of which being The Drakkengate. The noble houses of Noxus swore, though it might take a thousand years, to unify all the nations of Runeterra beneath a single banner. They established the Empire of Noxus with its first Grand General to lead their warhosts to victory.
In order to utilise the military advantage of petricite abroad, the sculptor Durand was commissioned to build some manner of moving petricite shield of petricite. And so he constructed 
Galio, a massive living petricite idol with wings, mirroring the image of the Winged Sisters. Galio would later protect a platoon of Demacian soldiers during their hold against a skilled order of invading warmages, known as the Arcane Fist. After all the invading mages were defeated, Galio returned to his pedistal and ceased to move. As the years would go by, the story of Galio would eventually be seen as nothing more than a mere legend.
- 349 AN - 772 AN
Zaun finalizes its plans to destroy a portion of the isthmus connecting Valoran and the Southern Continent, allowing safe sea passage between eastern and western Valoran. The plan involved using thousand of chemtech bombs to create the passage, but the results were catastrophic; in what seemed to be an accident, the bombs triggered a series of earthquakes that completely destroyed the isthmus and sank large districts of Zaun and thousands of its citizens, while also leaking poisonous gas in to the city's surviving areas. 
Janna, empowered by the prayers of Zaun's people, arrived and blew away the gas, saving many lives and being eternally remembered by Zaun's denizens, converting her from a goddess of faith for sailors to a guardian deity for Zaun. She has yet to leave Zaun following this event.
- 772 AN
Eventually Zaun was rebuilt. In order to regulate the oceanic passage they were built over, the Sun Gates were constructed, forcing all transport through the waters to be regulated by Zaun. This brought immense wealth to the city and likely led to Piltover's construction and elevation from Zaun, as the merchant clans were in control of most of the money coming through this trade route.
Progress Day is celebrated as the anniversary of when the gates opened for the first time, allowing trade to pass easily between the east and west of Valoran. Construction of the Sun Gates led to great changes in eastern Valoran and the eastern seas, as Noxus was from this point on able to more easily pool together resources from across its empire without needing land travel.
- 772 AN - 787 AN
Immigrants from Demacia, 
Freljord, and 
Ionia settle on the Serpent Isles. With more and more bedraggled fortune seekers washing up on their shores, missionaries from the 
Buhru granted these paylangi outsiders refuge in the southern island bays. While there were many years of cultural confusion, even including the name of the Serpent Isles, this settlement would eventually grow into the bustling port city of Bilgewater. 
Fizz surfaces above the Guardian's Sea for the very first time and started living around Bilgewater since then.
Trivia
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Kinkou Order seals away the forbidden shadow techniques- Evelynn took her lustful form
- 349 AN - 772 AN
- Ryze takes on Kegan Rodhe as his apprentice during one of his trips in the Freljord. Kegan Rodhe would eventually become Brand.
