Sentence:  If Henry does not fully trust him, is it surprising? A <WSD>prince</WSD> is alone: in his council chamber, in his bedchamber, and finally in Hell's antechamber, stripped – as Harry Percy said – for Judgment. 
Meaning of the word marked with <WSD> tags:  A (male) ruler, a sovereign; a king, monarch. (from 13th c.)