It's a common point of departure, and it's one that's quite difficult to do believably since by all accounts, Belisarius was an honorable man. He was loyal to his Emperor even when said Emperor probably didn't deserve it.
However, I think I have something that might work.
Queen Amalasuntha was known for supporting a merger of the Gothic and Byzantine realms. It was one of the reasons she was murdered in 535, after being imprisoned by her cousin Theodahad. Supposedly, Justinian tried to break her out of prison before this happened, but the task failed. In any event, she was murdered in her bath and the Gothic war was the immediate result, giving Justinian a pretext for invading the Gothic Kingdom.
POD 535 AD:
A young Ostrogoth assassin, a supporter of Amalasuntha's reign, in the employ of Justinian, manages to sneak onto the island of Martana where the former queen Amalasuntha has been exiled. Infiltrating the Gothic guards, he breaks her out of her prison and the former queen travels to Constantinople.
536:
Justinian sends his great general, Belisarius at the head of a Byzantine army of 7,500 regulars, to occupy Sicily and ostensibly restore Amalasuntha to power among the Goths (Justinian's real goal, of course, is one of conquest). Accompanying him is Queen Amalasuntha herself, who managed in the intervening year to attract a small Gothic contingent of approximately 2,500 men, disaffected with the rule of Theodahad. Simultaneously an attack is launched by General Mundus on the Dalmatian provinces. Amalasuntha's daughter Matasuntha escapes Italy, fleeing to Constantinople.
Sicily is quickly overrun and Dalmatia partially falls. General Mundus is mortally wounded, but still manages to inflict a humiliating defeat on the local Goth forces. The coastal regions revert to Byzantine rule but the interior remains unmanageable, disintegrating into small domains ruled by petty nobles, both Gothic and Roman.
537:
Belisarius and his army capture Rhegium and advance into Italy proper. Most Gothic garrisons resist, but Amalasuntha manages to convince some to side against Theodahad and the King's rule begins to collapse in Southern Italy. Naples falls and is subjected to sack, after which many of the cities of Italy open their gates to Belisarius.
Rome's fall is foregone conclusion by the time Belisarius advances to the eternal city's gates. The Goths, enraged at Theodahad's inactivity, overthrow him and appoint Vitiges as King. Several other Gothic nobles (mostly those with extensive estates in Southern Italy) decide to side with Amalasuntha instead, and the war rapidly becomes a civil war between the Gothic factions as much as a Roman war of conquest. Amalasuntha's forces split off from Belisarius's army under the command of her general, Theodemir, to harass the supply lines of an army gathering under Vitiges. A few native Roman civilians side with her as well, swelling the ranks of her army to nearly 5,000 men.
538:
Vitiges marches on Rome with a sizable army numbering over 30,000 men, prepared to defeat Belisarius and eliminate the threat to his rule posed by Amalasuntha. Reinforcements arrive from Constantinople just in time to fortify Belisarius's position, but he still faces a two-to-one disadvantage and remains bottled up in Rome. Small bands of Roman Cavalry harass the Goth's supply line, often with tacit help from the local Roman population and several Gothic nobles in league with Amalasuntha.
After nearly a year of stalemate, marked by sallies, rear-guard actions and ineffective assaults, a combined Roman/Gothic force composed of troops loyal to Amalasuntha take Ariminum, forcing Vitiges to abandon the siege and make for Ravenna.
One commander, John, disobeys the orders of Belisarius and tries to hold the town with Cavalry forces, and is defeated in battle. However, the city walls hold back the Goths for a time and reinforcements led by the eunuch Narses arrive to relieve the city just in time to save it, giving Narses a lot of credibility in the eyes of the army. Vitiges is caught between two armies and his supply lines are cutoff.
An argument breaks out among the Romans over who retains overall authority over the campaign, and Vitiges uses the opportunity to escape with the remnants of his army to Ravenna.
539:
Justinian proposes to divide Italy into northern and southern halves, with Vitiges retaining authority over the north including Ravenna and Justinian ruling the south, including Rome. Amalasuntha, enraged at this betrayal, threatens to wreck the entire deal. Meanwhile Narses attempts to take control of the negotiations while delivering reports to Justinian of Belisarius's unreliability.
Justinian, fearful that Belisarius will side with Amalasuntha or otherwise wreck the negotiations, has his estates confiscated and issues a recall order.
Belisarius is furious but still can't bring himself to disobey the order, and prepares to embark for Constantinople. Perhaps he fears for his wife Antonina or perhaps he still remains loyal to Justinian. Whatever the reason, it becomes clear to Amalasuntha that her chances of retaining power if Belisarius leaves are essentially zero. She arranges for Narses to be assassinated.
With the death of Narses, the Byzantine army in Italy reverts back to supporting Belisarius, but it's too late to stop word from reaching Constantinople of the assassination. The already-paranoid Justinian flies into a rage, demanding Belisarius's head, blaming him for the assassination. Antonina barely escapes with her life (some suspect Theodora actually arranged for her escape).
Seeing an opportunity to salvage something from the fiasco, Vitiges strikes a deal with Belisarius and Amalasuntha. Belisarius is offered the throne of the West with Vitiges and Amalasuntha ruling as foederati within the new Western Empire. Vitiges retains overlordship of the Goths of Northern Italy, and Amalasuntha over the Southern Goths.
Belisarius reluctantly accepts, seeing no other option, and the West Roman Empire is reborn.
However, I think I have something that might work.
Queen Amalasuntha was known for supporting a merger of the Gothic and Byzantine realms. It was one of the reasons she was murdered in 535, after being imprisoned by her cousin Theodahad. Supposedly, Justinian tried to break her out of prison before this happened, but the task failed. In any event, she was murdered in her bath and the Gothic war was the immediate result, giving Justinian a pretext for invading the Gothic Kingdom.
POD 535 AD:
A young Ostrogoth assassin, a supporter of Amalasuntha's reign, in the employ of Justinian, manages to sneak onto the island of Martana where the former queen Amalasuntha has been exiled. Infiltrating the Gothic guards, he breaks her out of her prison and the former queen travels to Constantinople.
536:
Justinian sends his great general, Belisarius at the head of a Byzantine army of 7,500 regulars, to occupy Sicily and ostensibly restore Amalasuntha to power among the Goths (Justinian's real goal, of course, is one of conquest). Accompanying him is Queen Amalasuntha herself, who managed in the intervening year to attract a small Gothic contingent of approximately 2,500 men, disaffected with the rule of Theodahad. Simultaneously an attack is launched by General Mundus on the Dalmatian provinces. Amalasuntha's daughter Matasuntha escapes Italy, fleeing to Constantinople.
Sicily is quickly overrun and Dalmatia partially falls. General Mundus is mortally wounded, but still manages to inflict a humiliating defeat on the local Goth forces. The coastal regions revert to Byzantine rule but the interior remains unmanageable, disintegrating into small domains ruled by petty nobles, both Gothic and Roman.
537:
Belisarius and his army capture Rhegium and advance into Italy proper. Most Gothic garrisons resist, but Amalasuntha manages to convince some to side against Theodahad and the King's rule begins to collapse in Southern Italy. Naples falls and is subjected to sack, after which many of the cities of Italy open their gates to Belisarius.
Rome's fall is foregone conclusion by the time Belisarius advances to the eternal city's gates. The Goths, enraged at Theodahad's inactivity, overthrow him and appoint Vitiges as King. Several other Gothic nobles (mostly those with extensive estates in Southern Italy) decide to side with Amalasuntha instead, and the war rapidly becomes a civil war between the Gothic factions as much as a Roman war of conquest. Amalasuntha's forces split off from Belisarius's army under the command of her general, Theodemir, to harass the supply lines of an army gathering under Vitiges. A few native Roman civilians side with her as well, swelling the ranks of her army to nearly 5,000 men.
538:
Vitiges marches on Rome with a sizable army numbering over 30,000 men, prepared to defeat Belisarius and eliminate the threat to his rule posed by Amalasuntha. Reinforcements arrive from Constantinople just in time to fortify Belisarius's position, but he still faces a two-to-one disadvantage and remains bottled up in Rome. Small bands of Roman Cavalry harass the Goth's supply line, often with tacit help from the local Roman population and several Gothic nobles in league with Amalasuntha.
After nearly a year of stalemate, marked by sallies, rear-guard actions and ineffective assaults, a combined Roman/Gothic force composed of troops loyal to Amalasuntha take Ariminum, forcing Vitiges to abandon the siege and make for Ravenna.
One commander, John, disobeys the orders of Belisarius and tries to hold the town with Cavalry forces, and is defeated in battle. However, the city walls hold back the Goths for a time and reinforcements led by the eunuch Narses arrive to relieve the city just in time to save it, giving Narses a lot of credibility in the eyes of the army. Vitiges is caught between two armies and his supply lines are cutoff.
An argument breaks out among the Romans over who retains overall authority over the campaign, and Vitiges uses the opportunity to escape with the remnants of his army to Ravenna.
539:
Justinian proposes to divide Italy into northern and southern halves, with Vitiges retaining authority over the north including Ravenna and Justinian ruling the south, including Rome. Amalasuntha, enraged at this betrayal, threatens to wreck the entire deal. Meanwhile Narses attempts to take control of the negotiations while delivering reports to Justinian of Belisarius's unreliability.
Justinian, fearful that Belisarius will side with Amalasuntha or otherwise wreck the negotiations, has his estates confiscated and issues a recall order.
Belisarius is furious but still can't bring himself to disobey the order, and prepares to embark for Constantinople. Perhaps he fears for his wife Antonina or perhaps he still remains loyal to Justinian. Whatever the reason, it becomes clear to Amalasuntha that her chances of retaining power if Belisarius leaves are essentially zero. She arranges for Narses to be assassinated.
With the death of Narses, the Byzantine army in Italy reverts back to supporting Belisarius, but it's too late to stop word from reaching Constantinople of the assassination. The already-paranoid Justinian flies into a rage, demanding Belisarius's head, blaming him for the assassination. Antonina barely escapes with her life (some suspect Theodora actually arranged for her escape).
Seeing an opportunity to salvage something from the fiasco, Vitiges strikes a deal with Belisarius and Amalasuntha. Belisarius is offered the throne of the West with Vitiges and Amalasuntha ruling as foederati within the new Western Empire. Vitiges retains overlordship of the Goths of Northern Italy, and Amalasuntha over the Southern Goths.
Belisarius reluctantly accepts, seeing no other option, and the West Roman Empire is reborn.
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