Guan Yu (-219), general of Shu and blood-brother of Liu Bei in Romance of the Three Kingdoms, fearsome fighter famous for virtue and loyalty
posthumously worshipped and identified with the guardian Bodhisattva Sangharama
Definitions (粵典–words.hk)
名詞、專名
歷史人物；字雲長，三國時代蜀漢大將。後世敬佩佢忠直仁義而崇祀佢，尊稱為「關公」、「關帝」、「關聖帝君」、「武聖」等；俗稱關二哥。 Guan Yu, a general in the Three Kingdoms Period
Examples (Wiktionary)
Mandarin
关羽
關羽
guān yǔ
Guan Yu (Chinese general of the state of Shu Han during the Three Kingdoms period)