Text: On what was once a Celtic burial ground (originally named Mont-Tombe), the bishop of the nearby town of Avranches began by building an oratory in the eighth century ' at the prompting, he claimed, of the Archangel Michael.
Entailment: An oratory was built near the site of Mont-Tombe.
Contradiction: The Celts never buried their dead near the site of Mont-Tombe.