Kāngsītǎndīng dàdì shì Luómǎ dìguó de zhòngyào tǒngzhìzhě.
Constantine the Great was an important ruler of the Roman Empire.
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康斯坦丁 refers to multiple figures: (1) Constantine the Great (272-337 AD), the first Roman emperor to convert to Christianity; (2) the 2005 Keanu Reeves supernatural action film in which the protagonist John Constantine battles demonic forces.
Keanu Reeves supernatural action film. John Constantine is a demon hunter who battles forces of hell in Los Angeles. Based on the DC/Vertigo comic Hellblazer.