Vahan declared Basil dead, but Vahan was smart; he knew the last time some had successfully used a Heraclian, he was hated, and it made sense that the dynasty had ruled for now 300 years, so he worded himself very carefully; he never declared himself emperor despite him being married to Irene; he always claimed that the revolt was on behalf of Leo; this combined with his iconoclast policies made the Balkans join his revolt. As he marched towards Constantinople and news of the death of Basil spread, all of north-western Asia Minor joined him against the iconoclast forces loyal to the now-dead emperor. With great haste, Vahan marched towards Constantinople, where the forces there were heavily outnumbered and their emperor was now dead. Yet many feared the outcomes of allowing Vahan into the city; many still believed he wanted the purple for himself, and that would lead to another civil war with Emperor Leo.
So in an act reminiscent of Caesar and Mark Anthony, did the Patriarch of Constantinople leave the walls to present to Vahan a crown and to bless his rule, fearing for his life as he was an iconoclast? The soldiers were silent for a moment, yet the general pushed away the crown, saying: The citizens do not need a new Basileus; they already have one.
As he pointed west towards the eternal city, the action, whether an act of political play or genuine fleeing, soon cast away all doubts as the gates were open, and Vahan, along with Irene, entered Constantinople as heroes as they restored the worship of icons, with some support, and then moved first to return the exiles and the icons back to the city; he would not move to root out Iconoclasm, not yet at least with one glaring expectation, he allowed the patriarch of Constantinople to leave the city, Ignatius II was recalled from his exile, and later Vahan sent a word to Leo apologizing for the death of his brother, he told him he had no ambition to be emperor of the east and he invited the emperor to come to be crowned In Constantinople, Leo was distrustful, for was he not the same man who was under the command of his brother and betrayed him? Who was to say he would not try something similar and slay him once he arrived in the capital? Still, Leo answered that he would come, but he could not leave Italy now, not when the Amazigh could still attack. He ordered Vahan to subdue or, if need be, crush the men in favor of his brother.
Vahan smiled when he heard about this; it was going to be an easy task by now. Lydia,Asia,Caria, Lycia, and parts of Phrygia fully supported him, as did Helespont, and the theme of Pontus and Armenia had diverged into civil war. The same was true of the principality of Armenia. It's not that these places supported Iconoclasm; this was hardly the case; rather, the military victories and the strong position of the ruling Bagratid family made them support the resistance against Vahan. After all, the Mamikonian family, ever since the 7th century, was the greatest rival to the Bagratid, and more than one Armenian source feared that Vahan would give the throne to his family or, better yet, if he could not be emperor, at least become Prince of Armenia.
But his confidence was to be shattered. Basil had barely escaped; he first intended to flee to his capital, but understanding and seeing how quickly the forces were moving, he crossed the straits. From Abydos, he fled towards the military center of Amorium, where he was welcomed by the local soldiers. Soon, he began to gather the forces to take back his throne, for he knew many soldiers in the east supported him for his great victory, but another player was to join the war: the Persians, like hawks, who had been eying the events in the Roman empire, The Shah Hormizd VII situation was not enviable; despite the great rule of Kavad III, the last years of his rule saw a shift in the climate; now cold spells were not new, which is one of the reasons why the 7th century marked the start of the Persian dark ages. During this time, aside from the political chaos, there were five cold events that hit Mesopotamia, Armenia, and northeastern Syria. The Romans could deal with the crisis, even with the four events listed in the 8th century, especially in 749–751, but Constantine V dealt with the crisis as many Armenians moved to Anatolia and Syria.
In the 9th century, another cold event went as far as Transoxiana, weakening the Tang presence, Iran, and further to Syria and Mesopotamia, but just as before the Romans weathered the storm, the political chaos of the crisis meant that the Iranians took advantage. Now it seemed Mother Nature had again chosen a favorite. Kavad III saw freezing weather from 919–921, leading to a grain shortage, leading to famine and riots. The cold extended to the Black Sea, but Shah Kavad did not hesitate to open the granaries. Yet in 926, with heavy snow and the cold that both the mighty tigris and Euphrastes froze, Kavad again opened the granaries to support the people as chaos erupted in Ctesiphon, but these cold events triggered a problem for Kavad: for a time now, the soil salinity of southern Mesopotamia increased, and the yield of wheat was reduced. Barley was more saline-resistant and did not suffer to the same extent. Consequently, farmers cultivated more barley and less wheat in response to growing salinization. To add to this, the cost of the irrigation system was high, and for as noble as Kavad III was the grain given, his spending on the learning and marvelous architecture along with the army changed caused some problems. This is likely another reason he invaded Arabia; after all, he did start getting some tribute from Kinda and even preferential trading in Yemen after he vanquished the Meccans. This is also another reason why he went to war with Rome to increase the tribute.
But now, years later, while Hormizd VII had not lost the war , he had to make peace and while in any other circumstances this would not have been as bad, The loss of tribute and the continuing degradation of the soil did not make him popular, and so, knowing that the Roman Empire was in civil war, he saw his chance to invade and force the Romans to pay tribute again. The Shah had a casus beli already; after all, he had made peace with Basil, who was now dead; thus, the treaty was null. As the Shah gathered his army, war loomed again in the east.