Human sacrifice in ancient Rome was rare but documented. After the Roman defeat at Cannae two Gauls and two Greeks were buried under the Forum Boarium, in a stone chamber "which had on a previous occasion [228 BC] also been polluted by human victims, a practice most repulsive to Roman feelings". Livy avoids the word "sacrifice" in connection with this bloodless human life-offering; Plutarch does not. The rite was apparently repeated in <answer>113 BC</answer>, preparatory to an invasion of Gaul. Its religious dimensions and purpose remain uncertain.
When was the invasion of Gaul by Rome?
113 BC