说明
be known to/by
核心问题
He soon made a name for himself and came to be known to the Italians as Giovanni Acuto. (New Concept English, Book 3, L. 14)
像 He's known to everyone as a good actor. 这样的句子里的 is known to 是很容易理解的，因为这里的 is known to 表达的是静态，而在我提问的句子里 came to be known 表达的是动态，为什么这里仍然用介词 to，而不用介词 by 呢？
词典解答
应当记住,人们把 be known (to) 看成是形容词结构,在与 come to 连用时,亦是如此。
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He's known to the police (as a criminal). (LDCE) 警察都知道他(是个罪犯)。
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Mr Jones has been known to me for several years... (CIE) 我认识琼斯先生已有好几年了……
虽然 be known to 是最常见的结构,但是也有人使用 be known by 结构,由 by 引出施动者:
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I don't think he's known to (or by) anybody here. (Palmer) 我认为这里谁也不认识他。
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That man is known by (or to) Jim. (Platt) 吉姆认识那个男人。
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He lives alone, in poverty, scarcely known by his neighbours. (Maugham) 他几乎不被邻人所知，穷苦孤单地生活着。