Parts of the following sentence have been given as options. Select the option that contains an error.
King Solomon of Israel is said to be one of a wisest man who ruled the earth.

The phrase "one of" is always followed by a superlative adjective with the definite article "the" and a plural noun.
The structure should be: one of + the + superlative adjective + plural noun.

Therefore, "one of a wisest man" contains two errors: "a" should be replaced by "the", and "man" should be replaced by "men".

The correct sentence should be: "King Solomon of Israel is said to be one of the wisest men who ruled the earth."