When granting the monastery of St Michael's Mount to the Norman monastery on the Mont Saint-Michel Robert recorded that he had fought at the Battle of Hastings under the banner of St Michel (habens in bello Sancti Michaelis vexillum).
Saat memberikan biara Gunung St Michael ke biara Norman di Mont Saint-Michel dan Robert, tercatat bahwa ia telah berjuang di Pertempuran di Hastings di bawah bendera St Michel (habens di bello Sancti Michaelis standar).