Relative pronoun

Definition and stakes

Samuel Kirkham,  English Grammar in Familiar Lectures

“ Relative pronouns agree with their antecedents, in gender, person, and number; as, "Thou who lovest wisdom;" "I who speak from experience."
NOTE. When a relative pronoun is preceded by two antecedents of different persons, the relative and the verb may agree in person with either, but not without regard to the sense; as, "I am the man who command you;" or, "I am the man who commands you." The meaning of the first of these examples will more obviously appear, if we render it thus: "I who command you, am the man."
”
Source: Gutenberg

Ignácz Singer,  Simplified Grammar of the Hungarian Language (1882)

“ Here both adjective and substantive being absent, the pronoun has taken the suffix.
The adverbial forms of these pronouns—ilyetén, olyatén—are inflexible, and determine only the verb. Ilyetén fogom varni, I will sow it in this way or such a manner (as that to which it refers) .
IV. Relative Pronouns.
Pronouns which refer or "relate" to things gone before are called relative pronouns. They are:
1. Ki, who; mely, which; mi, what; for substantives.
”
Source: Wikisource

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