Perdition's Angel

Novaroma: Book 1

In a desperate attempt to save humanity from extinction, a late 21st century AI named Mara, abducts a disparate collection of 5th century people. She maroons them on a bizarre, savage planet many parsecs from Earth.
Fraught with danger, the forsaken humans struggle against relentless foes on their new world with only their wits and iron age weapons.

Lucius Bernius, a Roman general, awakens there devoid of any memories, but understands things that should be impossible for him to know. To overcome the perils encountered, he must uncover the truth about his hidden past.

The resulting maelstrom even Mara could not foresee.