"I who has" vs "I who have."

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What rules make “Remember me, who am your friend” grammatical?

Am aware it is correct to say "I have written..." and "I am a doctor who has writen..."

I have, however, severally come across the sentence "I, Tertius, who have written...". Shouldn't it be "I, Tertius, who has written..."?

"Tertius" is parenthetical. The subject is the sentence is still "I" ... — Robusto, Apr 20 '12 at 12:30
The subject of the sentence is I, but the subject of the clause is who. — Brett Reynolds, Apr 20 '12 at 12:35
The simple answer is that it does not. See the linked question. — RegDwigнt, Apr 20 '12 at 12:41

score 3 · Answer 1 · answered Apr 20 '12 at 12:39

According to Fowler's Modern English Usage, "relatives take the person of their antecedents". This means that "who" in the example is first person, not third person, because its antecedent is "I". So "I, Tertius, who have written" is correct.

"I who has" vs "I who have."

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