The lesser nations of Europe was now near-leveled influentially with the Romans. The Romans were not losing power per-se, but they had leveled off. The Franks had gained some territory in Europe, as did the Celtics.
The Avars had betrayed the Bulgars. The former had allied with the latter in order to fend off the Huns. But once the Hunnic Empire had receded, the Avars broke their alliance and conquered the Bulgars. Much like the Britons, the Bulgars still existed in presence, but their names were off the map.
The Byzantines and the Western Romans had their own problems, mostly externally. The matter of war had not disappeared just because the Sasanians were gone. In fact, things got even worse.
Justinian II of the Byzantine Empire (652 to 711), took over immediately after the slow death of his father, Justinian I. Justinian II was much like his father in appearance and strategy. Some even found it difficult to differentiate from the two. But the son had never been a peasant and found it more difficult to understand the motives and beliefs of them. He sometimes dressed in peasants garb and sneaked into rundown bars to converse with the people of Constantinople. He learned many of their insights and home-grown strategies. Some bad, some good.
And it was one of those same strategies that saved the Byzantine Empire early in Justinian's reign. The threat in the east had increased substantially. The Sasanians were gone, but the Muslims were equally, if not more powerful and fierce.
After the first Persian-Byzantine War, the Byzantines had lost much of the Middle East and over a half of their territory. Justinian I was able to keep control over Antioch and Aleppo, but barely. He had an idea of how to defend the empire successfully, but died before being able to go through with any plans.
His son, however, managed to make it happen. He strongly fortified the outer empire, including Mesopotamia and Taron. He kept over 95% of his army in Samosata, Varengelliopolis (Named after the infamous assassin), and Aghtamar. Justinian's closest guards strongly advised for the emperor to place the military in cities much closer to Constantinople in case the invasion arrived by boat. But listening to his father and the people, Justinian chose to run it his own way. Luckily for him, his plan worked!
The greatest invasions arrived in Taron, the most fortified area. Justinian had heard from some of his peasant friends that some Muslim wanderer had "gave away the plans whilst drunk". Justinian took a wild chance and followed it. The foreign armies were swiftly defeated. Their 25,000-man army was no match to Justinian's astounding 300,000.
The invaders fled and Justinian basically switched to an attack position. He invaded the Caliphate-controlled Syria and won back Damascus, Tyre, and eventually, even Jerusalem. The second war turned out to end in Byzantine's favor. Next on his agenda, was Egypt. Perhaps the Muslim conquest would come to an early end?
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In the WRE, the emperor was starting to be seen as a joke. Camilus offered little to the people of Rome beside minor internal changes and his reign was stained with the mistake of offering his military to Lanatus III. Camilus died with no children to be heirs, so his nephew was crowned.
Spurius Galeo I (643 to 702) now served the state as emperor.
Galeo oversaw some of Europe's most dramatic changes. He heard of the invasions in the East, but was opposed to interfering. He did not want another Camilus Curse (Interfering leading to disaster) to occur. Under the table, he sent the Justinians gold, but no armies.
He wrote up several treaties with the Frankish leader, Pepin II. These treaties allowed for partnerships in any plausible wars against Caliphates if they ever reached Western Europe. They also more closely defined boundaries. The Franks were not to expand past the Alps. That also applied to the WRE, but they were not planning to expand much northward.
Galeo wished to advance onto Africa. Carthage was a well-fortified and populated city, but beyond that, not much territory belonged to the Roman country. The emperor invaded a bit further into the mysterious continent, renaming Vandal cities with Latin names whilst improving on their architecture. Small mining compounds were dug, providing large amounts of gold and silver to the European cities.
Florentia and Ravenna grew the most during Galeo's reign. The emperor himself even occasionally stayed in these cities. They were not up to the grand standards of Rome yet, but they were sure getting there.
Galeo I was viewed as a great ruler by the people of Rome, but not by the people of Africa. And that will make all the difference in upcoming decades as Islam expands into North Africa and eventually Iberia. But perhaps Christianity will also expand further South? The future will tell...
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The Sasanian Empire in Persia had controlled most of the Middle-East for over 400 years. It was ruled absolutely by a single monarch in a single dynasty for those 400 years. Constantly at war with the Eastern Romans for territory, it had little money to use for other affairs. The population was overtaxed, and the government did not care in the least.
The largest conflict came during Lanatus II's reign (in the ERE). Kavadh I of the Sasanian dynasty decided that his country's economic woes would be soothed if he controlled Mesopotamia. If a successful invasion were to occur, Kavadh would have access to the Mediterranean and thus, a European trade market. But the ERE had other plans for those markets.
What the Lanatus line had been doing, was trading with the Sasanians for foreign goods and pottery, and then trading with the WRE and the Franks those same goods for double the price. This 'Lanatus Trading Policy' was majorly successful. But as the Persians grew trade-savvy, they wanted no part in the LTP. Kavadh requested a port city in exchange for a number of goods, but Lanatus rejected all offers. Then the invasion began...
At first, the Persians overpowered the Romans. The ERE had underestimated Kavadh's military prowess. Lanatus died during these invasions, and his son took over the plate. Lanatus III evened out the playing field, increasing the number of soldiers in Damascus and Hamah, but foolishly neglected Jerusalem. The Sasanians were Zoroastrians and had no connections with Jewish or Christian teachings. So it did not bother them to demolish most of Jerusalem and destroy priceless artifacts.
Lanatus would have won the war by 610 if the Avars did not also invade. The army was divided and the Persians knew this. They increased military efforts and closed in on the ERE. Things looked even better for the Sasanians once Lanatus was killed. "Their king is dead!", they shouted, "Now we must conquer Constantinople!" However, a certain man named Muhammad changed the course of history and doomed the Sasanians in one of the most unexpected scenarios. Revolts sprung up in Persia, demanding the recognition of Islam.
Persian military numbers sharply lowered, many opposing the war. Many soldiers returned to Persepolis to rally for Islamic recognition. They rejected the idea of fighting for a non-Islamic state. This civil unrest combined with an economic crisis ended in disaster. By 660, the capital was overrun, the empire collapsed, and was absorbed into multiple Muslim Caliphates.