Constantine received his father-in-law not as a refugee, but with the full formal honors due a former Augustus. In the grand audience hall of Trier, before the assembled court, he greeted Maximian with respect, offering him luxurious quarters within the imperial palace and a place of honor at his side. It was a flawless performance of filial duty, a calculated display of magnanimity that Constantine knew would be reported throughout the Empire.
The private reality was far colder. That evening, at a small family dinner, the old emperor's veneer of weary dignity cracked, revealing the bitter, ambitious man beneath. "They dare!" Maximian seethed, slamming a wine goblet down onto the table. "Diocletian, in his dotage, and that Dacian peasant Galerius, they sit on the Danube and pretend to draw lines on a map that is no longer theirs to command! And my own son, Maxentius, wallows in Rome, content with Italy when the whole world is ripe for the taking!"
He turned his gaze on Constantine, his eyes burning with a restless fire. "You are too cautious, Constantine. You have the strongest army in the West. Galerius is weakened, his legions demoralized after their failure in Italy. We should be marching south, now, over the Alps! We could crush Maxentius and take Rome itself before Galerius could even react!"
"My legions secure the Rhine, Maximian," Constantine said calmly. "They protect Gaul from the barbarians, ensuring the stability my father built. That is my first duty. An invasion of Italy at this time would be… premature."
"Premature?" Maximian scoffed. "Fortune favors the bold! It is the motto of my house!"
"And prudence is the foundation of lasting power," Constantine countered, his voice soft but unyielding. The debate ended there, but the battle of wills had just begun.
Maximian, though granted every courtesy, was a prisoner in a gilded cage, and he knew it. He began to seek out company in the palace halls. One afternoon, he found Tribune Albinus, an ambitious cavalry officer, overseeing a training exercise. "You have a true feel for the horse, Tribune," Maximian boomed, clapping the younger man on the shoulder. "You remind me of myself, in the old days. My son-in-law is a fine strategist, very cautious. But caution does not win an empire on its own. A man needs fire. The kind of fire I see in you." The old emperor smiled, leaving Albinus looking pleased and thoughtful.
Valerius reported every such conversation. "He speaks of his old victories to the centurions. He reminds the Gauls of his past generosity. He finds the cracks in every man's ambition and pours honey into them."
Constantine listened to these reports without surprise. The old man was running his predictable course. The solution, he decided, was not to confront him, but to give him enough rope to hang himself. An opportunity came with reports of minor Frankish raiding near the mouth of the Rhine. He would use it as a pretext.
He first traveled south to Arelate (Arles), a major strategic city, taking Maximian with him. In the city's praetorium, he laid out a map. "I must march north to deal with this Frankish trouble," Constantine said. "I need a man of unquestionable authority to hold Arelate and all of southern Gaul. I am leaving you here, Father, with a contingent of troops and access to the local treasury."
Maximian's eyes gleamed with a poorly concealed avarice. "Of course, my boy," he said, his tone full of false sincerity. "I will guard it as if it were my own." The double meaning was lost on no one.
Later, in private, Constantine gave his true orders to a trusted agent of Valerius. "I will march north. Once I am past Lugdunum, I want a rumor to find its way back to Arelate. A convincing one, from a seemingly reliable source. Tell them I have been killed in a Frankish ambush."
The agent's eyes widened, but he nodded. "It will be done, Augustus."
As Constantine rode north from Arelate at the head of his army, leaving his father-in-law behind, he felt a cold sense of clarity. The old man, believing him dead, would not hesitate. He would seize the treasury, declare himself Augustus yet again, and show his treacherous hand to all of Gaul. Constantine was no longer simply responding to the chaos of his rivals. He was creating his own, directing the flow of the game, and setting a trap from which the serpent in his court would have no escape.