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The etymology of the particle "de" in the aforementioned nickname is not entirely clear. When written before a surname, it should indicate noble origins. In this case, we have to assume that Satan is a surname. Before a noble surname, there should be a title, for example, Marquis... well, let's not dwell on sad things, Baron, or, say, Count. Lord is, strictly speaking, not a title, but a general term for any titled nobleman, i.e., in this context, it is not used.