Adam of Bremen
As regards Osmund's character, background and standing as a missionary, it is not to be assumed that the characterization of him in Adam of Bremen 3, chapter 15, as an ungrateful, heretical vagabond and acephalous pseudo-archbishop, tells the whole truth about him. Happily, there is just enough evidence extant in medieval literary sources, not least in observations made by Adam of Bremen himself, to enable us to raise serious doubts about that verdict.