Gervase of Tilbury, Otia imperialia, ed. and trans. S.E. Banks and J.W. Binns (Oxford, 2002), 150-1: `There was also Isoret, whom St William killed: we have seen his tomb in a suburb of Paris, and it is twenty feet long even without the head and neck ...'. Harrison misread the name of the dead man as that of his place of burial.