An archaic or colloquial second-person pronoun meaning 'you'. The reading here (きんじ) is old-fashioned and rarely used in modern speech.
古文書には「君（きんじ）よ、聞け」と呼びかける記述が見られる。
In old documents you can see addresses like, 'You (kinji), listen.'
この時代の物語で『君』と呼ばれる人物は身分の高い相手を指すことが多い。
In stories of this period, a person addressed as 'kimi' often refers to someone of high status.