Carcer Roman Compound (Location)
A Roman camp in the hunting village of Nathos, in Herakleion Nome. You'll have to clear the place out during the Reunion side quest.
If you show up during that quest, the Romans within are probably fighting the Child, so wade in when ready, either preparing the way with sniper fire or a backstab (with a possible side of chain assassination).
Prioritize the camp leader, but kill all of them. When the compound is clear, loot the red chest at the base of the central tree to complete the location.