Historian Elizabeth van Houts considers this aspect of the story to be consistent with evidence concerning expeditions led by Robert the Frisian on behalf of his father Baldwin V, Count of Flanders in the early 1060s.
A historiadora Elizabeth van Houts cre que este aspecto da historia é consistente coa evidencia de expedicións conducidas por Roberto o Frisio en beneficio do seu pai Balduino V, Conde de Flandres a comezos da década de 1060.