Sentence:  In "Guy" a duke in council <WSD>"thous</WSD>" his emperor [...] In "Bevis" the earl addresses the emperor of Almaine [...] while the young son of the family, Bevis, <WSD>"thous</WSD>" him not only as his father's murderer [...], but even when he is pretending friendship for him [...]. 
Meaning of the word marked with <WSD> tags:  To address (a person) using the pronoun "thou", especially as an expression of contempt or familiarity.