141 A.D. Mission in Dacia (2018) on Netflix

Plot summary

On the frontier of the Roman province of Dacia, a sickness spreads among the soldiers quartered in a fort, and the doctors cannot name its cause. The number of the dead keeps rising. The year is 141, and a comet has crossed the night sky; the astrologers call it a sign of misfortune and death. Prefect Cornelius Fulvius, who commands the fort, gives Centurion Marcus a mission. With Aquila, Tertius and Nerva, the experienced officer is to ride beyond the imperial frontier into the lands held by the Free Dacians and bring back a remedy. Their road leads to the Serpent Mountains.