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I'm not sure if these two have the same meaning, but I don't think they bear
the meaning that I know which is the basic なる (to become).

>   1. 内なる声と言いますか・・
>
>   2. 彼女よりさらに深遠の、未知なる人物こそが黒幕なのではないかと疑わせるのだ…。
>
>
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2017-09-06T13:13:35.243
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grammar
What does なる mean in these cases?
It's the 連体形 of the old auxiliary [なり](http://www.hello-
school.net/haroajapa009008.htm). You can replace it by である.
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2017-09-06T13:31:43.980
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なる has several different meanings in Japanese. "To become" is just one of
them.

From [this
dictionary](https://kotobank.jp/word/%E3%81%AA%E3%82%8B-348198#E5.A4.A7.E8.BE.9E.E6.9E.97.20.E7.AC.AC.E4.B8.89.E7.89.88),
there are the following meanings of it:

> なる
>
> 〔断定の助動詞「なり」の連体形〕
>
> ① …にある。 「内－世界」
>
> ② …という名の。 「顔回{がんかい}－者」
>
> ③ …に当たる。…である。 「義兄－人物」

Your sentence should fall into this category.
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2017-09-06T13:33:03.780
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This なる is a form of the old copula なり (equivalent to modern だ), and
specifically an earlier form of the usage that became the modern な particle
used with adjectives. There are a few adjectives that can still take なる
instead of な in modern Japanese; this form generally has a literary or poetic-
sounding effect.

In the case of the specific two adjectives used here, 内 and 未知, the なる form is
actually the only form they can take as な-adjectives in modern Japanese - 内なXX
and 未知なXX aren't really used. However, they can be used regularly as noun
forms, so 未知なるXX could be rephrased as the equivalent but less poetic-sounding
未知のXX, and 内なるXX similarly as 内のXX (though in the latter case it's perhaps not
the most natural expression).
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2017-09-06T13:36:56.390
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I would interpret “1.内なる声” as “my inner voice,” and 2.” 未知なる人物” as “the person
I don’t know yet.” “なる” used in both examples means “which / who is,” like the
voice which is (sounds) in my heart, and the person whom I’ve not known / met
yet.

We can say：

複雑なる関係 – relationship which is complicated

彼の妻なる女性 – a woman who is said to be his wife.

日本のピカソなる棟方志功 - Munakata Shiko who is regarded as Japanese Picasso

更なる投資 – further investment

All different from another usage of ….になる、meaning to become.

"ABC なる xyz" is a pretty common usage, and not an old locution.
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