Following the release of the hostages, Galla Placidia reluctantly married Constantius, a political arrangement forged so that the Western Empire would have an heir to the throne. A girl, Honoria, was the first-born, followed by a son, Valentinian III. Like many sons of preeminent fathers, Aëtius returned to Rome to follow in his father’s footsteps.
After the deaths of Constantius III in 421 and Emperor Honorius in 423, Theodosius II, Emperor of the Eastern Empire, posthumously recognized Placidia’s second husband Constantius III as Co-emperor of West, then appointed Galla Placidia as Regent Augusta of the Western Empire because her Emperor son Valentinian III was not yet of age. Initially, Castinus, a ranking figure in civil government in the West, was recognized as an advisor, but in 430 it was Aëtius who had worked his way through the ranks and was appointed as Master of Both Services by Galla Placidia. However there was fierce rivalry between Felix and Aëtius, leading evidently to Aëtius stirring up a riot in Ravenna which led to the death of Felix and his wife Padusia. Although this act cast a shadow upon Aëtius’s morality, Galla Placidia retained him as leader of the West. From this time onward until the end of his life, he was the dominating force of the Western Empire. He was thrice the Consulibus and was granted the title of Patrician, pacifying and controlling Gaul for an extended number of years.
Borrowing material from Frigeridus, Gregory of Tours described Aëtius as “strong and courageous, comely in form, knowing nothing of infirmity or other like burden, keen in mind, active of body, a most ready horseman, well skilled with arrow or pike, marvellous in battle.”
Yet there was also discord between Boniface, another general of Placidia’s, and Aëtius. Although he was extolled by citizens and soldiers alike for his successes in Gaul, Aëtius had renewed an alliance with the Huns and restored land taken from them by Felix. In 432, displeased by her Magister, Placidia replaced the recalcitrant Aëtius with Boniface, but Aëtius immediately rebelled, attacking Boniface near Rimini. Each surrounded by their armies, the two met in in single combat, resulting in the death of Boniface. Fearing the Regent’s wrath, Aëtius fled to Pannonia for shelter among the Huns, whom Aëtius had befriended earlier when he had been their hostage.
Placidia replaced Aëtius with Sebastian, Boniface’s son-in-law, whose competence level was far inferior to Aëtius’s. Dismayed, the Regent felt she had no choice and recalled her paradoxical arch-enemy yet effective Magister. Upon his return, Aëtius’s first act was to exile Sebastian. In 434 he was granted the title Patrician, and by the year 437 Placidia’s regency had ended, and Valentinian, age eighteen, ascended to the throne. But the power behind the throne was still Placidia, and ultimately, Aëtius, who was awarded Consulship in that year and again in 446.
It is the year 446 which connects a gossamer thread to Britain. Gildas Badonicus records in Section 20 of the De Excidio
So the miserable remnants sent off a letter again, this time to the Roman commander Aëtius, in the
following terms: ‘To Aëtius, thrice consul: the groans of the British.’ Further on came this complaint:
‘The barbarians push us back to the sea, the sea pushes us back to the barbarians; between these two
kinds of death, we are either drowned or slaughtered.’ But they got no help in return. (See Aëtius in
Major Historical Characters of the novel section)
Eleanor Duckett, in her book Medieval Portraits From East and West quotes John of Antioch who best summarizes Aëtius’s deeds and achievements:
his protection of the Regent-Empress Placidia and her son; his final victory over Boniface; his slaying of
Felix who, he said, longed to murder him; his subduing of the Goths who invaded, of the Armoricans who
rebelled; his command of situations political and military, at home and abroad.
She then quotes Marcellinus who perhaps had deeper insight:
Aëtius was the strong salvation of the Empire in the West, and with him it fell dead.”
She cites another mark of interest from John of Antioch:
And when Aëtius lay murdered, the emperor [Valentinian III, who murdered Aëtius in a fit of jealous rage]
said to one who would understand his words: ‘The death of Aëtius was no happy thing for me.’ And the
man to whom he spoke replied: ‘Whether it was a happy thing or not I do not know. But I do know that
you have cut off your right hand with your left.’ ”
Aëtius’s close friend Petronius Maximus, with two other comrades sought revenge against Valentinian on March 16, 455, one year after the death of Aëtius. Duckett writes
With these same men [Petronius, Optila, and Thraustila] the Emperor rode out from Rome to the Field of
Mars, to watch the public games. He had left his horse and was walking toward the archers on the field,
when Optila ran forward and struck him twice, on the side of his head and on the face. Revenge had
done its work; the Emperor Valentinian III was dead. Thraustila also killed Heraclius. Seizing the Imperial
crown and Valentinian’s horse, the two murderers hurried away to find Petronius. Neither of them was
brought to punishment. All those present were stunned by the shock of the moment, and when they had
recovered from this they prudently decided to leave justice alone. Optila and Thraustila were bold and
forceful fighters.
Most of the historians consider this act as the end of the Western Empire. Petronius Maximus acquired the power for one year, followed by the ineffective rules of Avitus, Majorian, and Libius Severus. Anthemius, who ruled from 467 to 472, was the last glimmer of hope, but even with the help of Riothamus from across Ocean, he could not salvage the West.