PROLOGUE

FORT SEGEDUNUM, HADRIAN’S WALL

BRITANNIA SUPERIOR, ROMAN EMPIRE

MARCH, 367 AD

The wind came off the northern hills like the breath of some ancient god, cold and relentless, carrying with it the scent of heather and distant rain. Centurion Marcus Corvus stood at the window of the principia, the headquarters building of Fort Segedunum, and watched the grey clouds mass above the Wall. Twenty

years on this frontier had taught him to read the weather as well as any Pictish shaman—and what he saw now promised storms.

Behind him, the brazier crackled and spat, its warmth barely reaching the stone walls that had stood sentinel at the eastern terminus of Hadrian’s Wall for more than two centuries. The fort had been built to last, its massive blocks of dressed stone fitted so precisely that a knife blade couldn’t slip between them. Yet for all its permanence, Marcus knew that empires were more fragile than stone. They depended on men—and men could be broken, corrupted, or simply made to look the other way at the wrong moment.

He turned from the window as footsteps echoed in the corridor outside. Heavy boots on flagstones, accompanied by the jingle of military harness and the murmur of voices. Marcus straightened instinctively, his hand moving to adjust the leather balteus that crossed his chest, checking that his pugio sat properly at his hip. Old habits. A soldier’s habits.

The door opened without ceremony.

Legatus Artorius Castor entered like a man who owned not just the room but the entire northern frontier. He was tall, broad-shouldered, his face bearing the kind of patrician features that spoke of generations of senatorial privilege. His armour was parade-ground perfect—polished lorica segmentata that had probably never seen real combat, a crimson cloak fastened with an ornate fibula that cost more than Marcus earned in a year. Behind him came two tribunes, younger men with the same air of entitled confidence, and a secretary clutching wax tablets.

Marcus saluted, fist to chest. “Legatus.”

Castor acknowledged the gesture with a slight nod, his eyes already scanning the room as if assessing its worth. “Centurion Corvus. I understand you requested this meeting with some urgency.” His tone suggested that urgency was a relative concept, and that whatever Marcus had to say had better justify interrupting the legatus’s schedule.

“Yes, sir. Intelligence from beyond the Wall. The situation has changed significantly in the past month.”

Castor moved to the table that dominated the center of the room, where Marcus had laid out his maps. They were good maps, better than the official ones issued by the provincial administration. Marcus had spent years refining them, adding details gleaned from countless reconnaissance missions—the locations of Pictish settlements, the paths through the forests, the river crossings, the places where an army could move unseen.