By this sign, conquer.
ἐν τούτῳ νίκα (In hoc signo vinces).

Politicians
Constantine the Great
Roman emperor (r. 306-337) and the first Christian on the throne. Legalised Christianity (Edict of Milan, 313), convened Nicaea I (325) and founded Constantinople — yet executed his wife and son in 326.
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Source: エウセビオス『コンスタンティヌスの生涯』1.28 (ミルウィウス橋戦の前夜の幻視として)Disputed