Archegnum
TNPer
@Yrkidding, though McMasterdonia should probably read this too.
I see your point. We need to intertwine our nations' history as much as possible, to make it realistic, which obviously involves older political entities
For the following timeline (breakup of the last Archipelagian Kingdom to the annexation of Boraea into the United Nine), I've used your timeline dates that involve BC. I don't know if that is the equivalent of our BC or if its something else, but for simplicity I'll use it. We can always change it later.
707BC: High King Erurainon IV dies at the age of 64 with three male heirs, triplets. None have been declared Crown Prince. The House of Eru comes to an end.
706BC: Uios, the eldest (marginally) declares himself High King on the Isle of Quachel, in the Archipelegian Citadel of Rachtin. The two other brothers refuse to recognise him.
704BC: Civil War begins. Euiven the Noble, already Lord of Lorem, also declares himself High King in the city of Lorem. Veapos, the youngest (marginally) son, does not support his claim, but neither does he support his eldest brother.
699BC: The Archipelegian Kingdom breaks down entirely. Five years on, Uios has ended all opposition on Quachel and assembled a fleet. The First Battle of the Straights begins as the Quachilian Armada sails towards Lorem and Southside (the southernmost province of Archegnum). Neither side wins decisively, but the Armada returns home.
657BC: The Bluepoint Uprising. Loremian authority over Bluepoint is overthrown in a Quachilian-backed rebellion. The uprising is quashed, but the southern city-states of Southside break away from the direct control of any of the three factions.
654: Uios, Iget (‘ruler’ in Archegnuman) of Quachel, dies. His son, Uios II, takes the Quachilian throne.
651BC: Euiven and Veapos die in the same year. Lorem expects to receive Lady Hyaline, Euiven’s daughter, as their Iget, but a chauvinistic-motivated coup replaces the monarchy with an oligarchic Republic, a Doge at its head. Veapos’s son, Eruroth, becomes Iget of the ‘North’.
637BC: Eruroth proclaims the ‘Kingdom of Boraea’ in the north of the former Archipelegian Kingdom, with McMasterdonian backing. Eruroth cites the Republic in Lorem as a symbol of the death of Archegnum, but still claims his rights to the ‘High Kingship’ over the archipelago, vowing that his House will reunite it one day.
620: Under increasing military threat from the Igetia of Quachel, Boraea swears fealty to the McMasterdonian Emperor and becomes his vassal, effectively bringing the fledgling Kingdom into the Empire. Napier, Boraea’s ally, follows not long afterwards.
593BC: After many years of skirmishes, Quachel and Lorem go to war again after a trade dispute through the Strait erupts into conflict.
585BC: The Iget of Quachel agrees to swear fealty to the Emperor of McMasterdonia in return for support in his war with Lorem. The Emperor agrees.
582BC: Quachel officially joins the Empire as a vassal state. Imperial support against Lorem sharply increases.
576BC: The war against Lorem ends after many years, with an Imperial victory in the Second Battle of the Strait. Lorem is forced to give up its dominion over Bluepoint and relinquishes its directly ruled territories on the mainland to Imperial authority, under the rule of Quachel.
569BC: The Grand Duke of Bluepoint and its territories, under the influence of the Empire through Quachel, swears fealty to the Emperor, becoming a member state.
555BC: The Grand Duke of Bluepoint dies. Treaty of Union between Quachel and Bluepoint – Bluepoint and its Grand Duchy annexed into Quachel under the Emperor.
532BC: An event known as the ‘Titular Crisis’ occurs. The Iget of Quachel, still with his (unrecognised by the other Archegnuman states) title ‘High King’, declares himself such over Lorem, Boraea and the southern city-states. The Emperor intervenes of behalf of the King of Boraea and instead threatens to award the title to him. Quachel withdraws after similar threats from the other Kingdoms on Archlancer.
519BC: Quachel occupies the port city-states of Asimi, Defteros and Igatea on the western coast of Southside. This is supported by the Empire. Lorem protests but is too weak to intervene. The move brings the inland cities under economic subservience to Quachel.
506BC: Quachel stirs up a fishing dispute with Lorem into an excuse for war, swiftly occupying the city and unilaterally annexing it into its territories.
500BC: In this symbolic year, the Emperor of McMasterdonia officially crowns the Iget of Quachel ‘High King’ over all Archegnum. This worries the Boraeans, but to the Empire, they are a separate entity in their own right and detached from Archipelegian issues, despite their history. In this, the Emperor is wrong. The High King refuses to recognise the new state as an ‘Archipelagian Kingdom’ for this reason.
484BC: By now, all of the city-states of Southside have been annexed into Archegnum.
470-425BC: In this periods, numerous tensions, skirmishes, and diplomatic confrontations occur between Archegnum and Boraea. All attempts an annexation fail, due to pressure from the other Archlancerian states and the Imperial government.
424BC: The Kingdom of Boraea is annexed into the ‘United Nine’, after the Boraean King, Nabonidon II, abdicates under pressure from the other Kingdoms of Archlancer. Although not of pure ‘Southmen’ stock, Boraea affiliates itself with them.
I see your point. We need to intertwine our nations' history as much as possible, to make it realistic, which obviously involves older political entities
For the following timeline (breakup of the last Archipelagian Kingdom to the annexation of Boraea into the United Nine), I've used your timeline dates that involve BC. I don't know if that is the equivalent of our BC or if its something else, but for simplicity I'll use it. We can always change it later.
707BC: High King Erurainon IV dies at the age of 64 with three male heirs, triplets. None have been declared Crown Prince. The House of Eru comes to an end.
706BC: Uios, the eldest (marginally) declares himself High King on the Isle of Quachel, in the Archipelegian Citadel of Rachtin. The two other brothers refuse to recognise him.
704BC: Civil War begins. Euiven the Noble, already Lord of Lorem, also declares himself High King in the city of Lorem. Veapos, the youngest (marginally) son, does not support his claim, but neither does he support his eldest brother.
699BC: The Archipelegian Kingdom breaks down entirely. Five years on, Uios has ended all opposition on Quachel and assembled a fleet. The First Battle of the Straights begins as the Quachilian Armada sails towards Lorem and Southside (the southernmost province of Archegnum). Neither side wins decisively, but the Armada returns home.
657BC: The Bluepoint Uprising. Loremian authority over Bluepoint is overthrown in a Quachilian-backed rebellion. The uprising is quashed, but the southern city-states of Southside break away from the direct control of any of the three factions.
654: Uios, Iget (‘ruler’ in Archegnuman) of Quachel, dies. His son, Uios II, takes the Quachilian throne.
651BC: Euiven and Veapos die in the same year. Lorem expects to receive Lady Hyaline, Euiven’s daughter, as their Iget, but a chauvinistic-motivated coup replaces the monarchy with an oligarchic Republic, a Doge at its head. Veapos’s son, Eruroth, becomes Iget of the ‘North’.
637BC: Eruroth proclaims the ‘Kingdom of Boraea’ in the north of the former Archipelegian Kingdom, with McMasterdonian backing. Eruroth cites the Republic in Lorem as a symbol of the death of Archegnum, but still claims his rights to the ‘High Kingship’ over the archipelago, vowing that his House will reunite it one day.
620: Under increasing military threat from the Igetia of Quachel, Boraea swears fealty to the McMasterdonian Emperor and becomes his vassal, effectively bringing the fledgling Kingdom into the Empire. Napier, Boraea’s ally, follows not long afterwards.
593BC: After many years of skirmishes, Quachel and Lorem go to war again after a trade dispute through the Strait erupts into conflict.
585BC: The Iget of Quachel agrees to swear fealty to the Emperor of McMasterdonia in return for support in his war with Lorem. The Emperor agrees.
582BC: Quachel officially joins the Empire as a vassal state. Imperial support against Lorem sharply increases.
576BC: The war against Lorem ends after many years, with an Imperial victory in the Second Battle of the Strait. Lorem is forced to give up its dominion over Bluepoint and relinquishes its directly ruled territories on the mainland to Imperial authority, under the rule of Quachel.
569BC: The Grand Duke of Bluepoint and its territories, under the influence of the Empire through Quachel, swears fealty to the Emperor, becoming a member state.
555BC: The Grand Duke of Bluepoint dies. Treaty of Union between Quachel and Bluepoint – Bluepoint and its Grand Duchy annexed into Quachel under the Emperor.
532BC: An event known as the ‘Titular Crisis’ occurs. The Iget of Quachel, still with his (unrecognised by the other Archegnuman states) title ‘High King’, declares himself such over Lorem, Boraea and the southern city-states. The Emperor intervenes of behalf of the King of Boraea and instead threatens to award the title to him. Quachel withdraws after similar threats from the other Kingdoms on Archlancer.
519BC: Quachel occupies the port city-states of Asimi, Defteros and Igatea on the western coast of Southside. This is supported by the Empire. Lorem protests but is too weak to intervene. The move brings the inland cities under economic subservience to Quachel.
506BC: Quachel stirs up a fishing dispute with Lorem into an excuse for war, swiftly occupying the city and unilaterally annexing it into its territories.
500BC: In this symbolic year, the Emperor of McMasterdonia officially crowns the Iget of Quachel ‘High King’ over all Archegnum. This worries the Boraeans, but to the Empire, they are a separate entity in their own right and detached from Archipelegian issues, despite their history. In this, the Emperor is wrong. The High King refuses to recognise the new state as an ‘Archipelagian Kingdom’ for this reason.
484BC: By now, all of the city-states of Southside have been annexed into Archegnum.
470-425BC: In this periods, numerous tensions, skirmishes, and diplomatic confrontations occur between Archegnum and Boraea. All attempts an annexation fail, due to pressure from the other Archlancerian states and the Imperial government.
424BC: The Kingdom of Boraea is annexed into the ‘United Nine’, after the Boraean King, Nabonidon II, abdicates under pressure from the other Kingdoms of Archlancer. Although not of pure ‘Southmen’ stock, Boraea affiliates itself with them.
Although I'm still thinking of mechanisms and reasons as to how Dallicania could've resisted assimilation and foreign influence (again, like Bohemia?), especially when our northern neighbor seems to have accepted lots of it and Dallicanians didn't. 
