There is some confusion here about how relative clauses work. See McCawley's SPHE for a good description. Here are some notes:
The antecedent of the relative pronoun in a restrictive relative clause is the entire noun phrase within which the relative clause occurs (not what the relative clause modifies). (In the preceding sentence, the antecedent of "which" is the noun phrase "the entire noun phrase within which the relative clause occurs".)
A restrictive relative clause modifies an N-bar, not a noun. (So in sumelic's example in the comment, the relative clause modifies the N-bar "someone strong".)
Restrictive relative clauses can sometimes be extraposed to the end of the verb phrase, as in "A man appeared who had a sinister red beard."
A relative clause does not in general begin with a relative pronoun, but rather with a relative expression within which a relative pronoun occurs (as for instance this very relative clause, which begins with "within which").