[hider=Accrossinate Empire Timeline]
B.d means Before birth of Dristi and a.d means After the death of Dristi. More information on the matter bellow. 

57 to 53 b.d - Elven city states established on Crassonia.
49 b.d - Five dominant city state fight for influence over lesser city states.
41 b.d - Theollisian Empire emerges from the frontiers of Beiros, one of the city states. City states unite to combat the threat.
 - Theollisian Empire battles the Crassonian city states coalition on Serros' Pass. Coalition was able to hold off the enemy for five days against their enemy with superior numbers. was defeated when Theollisians discovered alternative route to entrap their enemies. 
 - Those who retreated from the battle of Serros' pass face the Theollisians in battle on an open field just miles away from Beiros. Coalition wins against Theollisians by out flanking them Theollisians forced to retreat. 
38 b.d - Theollisian Empire attempts to once again invade Crassonia from the sea. Nattanos, one of the city states, learns of the plan and uses their fleet to stop the invading enemy fleet. Theollisian fleet survived the assault and Theollisian army lands on the beaches of Venos, anoither of the city states. Crassonian hoplites were prepared on the beaches and quickly defeated the Theollisian forces.
 - Alliance was made between the five city states. Any of the members who broke the treaty would be destroyed by the other five.
34 b.d - Prince Keos of Beiros runs off with Lainna, the wife of Teculus, king of Mecellonia. Starts the Beirosan war. After 4 months of battle, the coalition won by sending a wooden horse inside the city with warriors inside as a token to the sea ancient Crassonian God. Beirosians were to offer it as tribute when the coalition supposed left. The warriors inside the horse jumped out at mid night and opened the gates for the rest of the forces. Beiros was destroyed and was then under Mecellonia.
29 b.d - Alliance between the city states were broken once again when Alexendros, king of Mecellonia, battled and defeated the other city states. Used the combine forces of the five city states to defeat the Theollisians and march west. 
27 b.d - Alexandros' warriors refuse to march west and Alexandros is forced to return home. Died of sickness. Was suppose to be burned in a funeral pyre back in Mecellonia but he's body was lost.
19 b.d - City states once again battle each other. A minor city-state, Salos, had wanted to escape the subjugation of Arres and join the influential sphere of Nattalos instead. The Arres retaliated by sending her hoplites to destroy the city. They were met by Nattalosian warriors however who refused to give their ground. Started the Pennolisian war. Nattalos and Venos started the Pennolisian pact along with 4 other minor states. They faced the Deomidian pact made up of the northern states of Arres, Mecellonia and Beirosian along with 3 other minor states. The Pennolisian pact used their advantage, their superior navy, to destroy enemy merchant ships and block enemy ports. They also used the navy to land their men on the enemy coast line to raid the farm lands close to the coast. The Deomidians however used their superior army to drive off the enemy farther and farther away out into the coast and stop the supply of goods going into their city via roads. The war led to a stalemate and by the winter of 18 b.d, both sides had agreed to a truce. The Deomidians used the opportunity to build a competent fleet while the Pennolisians build strategic outposts and bolstered their armies. By the spring of 17 b.d, the truce was called off and the war resumed between the opposing forces. Every tactic and strategy was used by both side but a stalemate was reached yet again by late summer. Fortunes changed however when Nattalos was crippled by a devastating plague during autumn. Venos was forced to surrender shortly after and the Deomidians enforced harsh sanctions on the enemy states. The war did take a heavy toll on the victors however. Arres was taken by a slave revolt and was never able to recover again and the farmlands of Beiros was razed so badly by the Pennolisians that it would take years to recover. The Mecellonians became the most dominant power in the region and there was nothing the other states could do. 
13 b.d - Orminnian Empire was now expanding east after it had beaten it's arch-enemy, the Carriginians, to the west. The first to put a resistance against the advanicng Orminnians was the Mecellonians. The armies that met were equally matched however the Orminnians used javelins to penetrate their enemy from a distance before finishing them off with their short swords. The Orminnians defeated the Mecellonians with ease, using their javelins to break the enemy rows and charge in to finish the kill. The Orminnian cavalry then finished off the stragglers who routed. Mecellonia then summoned the other states to stand against the invading Orminnians. They were promised payment from Mecellonia if they successfully repelled the attackers. The other states also saw their chance to escape from the Mecellonians and began free yet again. The Orminnian Empire was also another threat to their sovereignty. The other states agreed. The battle between the alliance of the five states and the Orminnian legion was as swift as it had been with the Mecellonians alone, with the same outcome. The hoplites were annihilated by superior Orminnian legion. Crassonia made part of the Orminnian Empire. 
3rd a.d, a new religion began to the Empire. Started by a Ghramite carpenter, the religion spread rapidly throughout the every the Empire. Aisus Dhristi, the leader of the growing cult, was quickly sentenced by the governor of the Empire to be tortured and killed. The Orminnians whipped Dhristi and placed him on a breaking wheel. The wheel tore him and half and his followers buried him inside a cave which was sealed by a giant rock. On the fifth day, his followers went to visit his tomb only to find the rock has been moved and the tomb empty. They claimed that an angel stood there and told them that their savoir had returned back to his father. This strengthened the resolve of the his followers. The Emperor of the time, Vallecious, persecuted the the followers of Dristi. The same elf who ordered the death of Dristi however, Konstantine, rose up for his followers. A massive civil war ensued between the largely pagan west and the followers of Dristi to the east. The war took three years but at the final battle of Oppus, a comet struck at a pagan temple which severely demoralized the western forces. They're morale was completely sapped when the forces of Konstantine unveiled their purple banner with the holy trinity, the father, the son and the holy spirit, towards their enemy. The western forces routed and Konstantine was able to capture Vallecious and execute him. He then declared himself the new Emperor and instated the Church of Dristi as the State Religion of the Empire. 
5 a.d - Hannoic horde coming from the east batters the Orminnian Empire. 
7 a.d - Orminnian Empire wins a Pyrrhic victory against the Hannoic Empire. Hannoic hordes expansion was stopped and the Orminnian Empire was spared from further destruction. 
8 a.d - Sestella, warlord of the Hannoic horde, dies. Hannoic horde fractures. 
15 a.d - Jakarta plague hits. Orminnian Empire begins to collapse. 
539 a.d - Five years before the Golden Era the start of Landen Shelly's inventions and the official start of the Golden Age. A new Emperor had rose in the city of Konstalinnos and was preparing to take back the lost territories of his empire. The new Empreror, Deriodedos I, began building up the formidable legions of the past empire yet again and used the same doctrines.
551 a.d - All the eastern territories of the Orminnian Empire was reunited with the Emperor of Konstalinnos. The new empire was name the Accrossinate Empire, after the old city of Accrossia which the city of Konstalinnos was build upon.
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The timeline mostly concerns my Empire but maybe it can help.