Itachi Uchiha knew the true identities of Naruto's parents because he was a member of the Uchiha clan and had access to the clan's historical records. Itachi was a highly skilled and knowledgeable ninja who was privy to confidential information within the village. Additionally, Itachi had a personal connection to Naruto's parents through his friendship with Naruto's father, Minato Namikaze, who was the Fourth Hokage of the Hidden Leaf Village.
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Itatchi was older than Naruto's generation. He would have been old enough to remember when Naruto was born, and who his parents were. All of the elders in the leaf village knew. They just thought it best not to discuss it.
wft? Naruto didn't kill itachi's parents. itachi killed the clan. u dodo brain. look it up
actually, sasuke didn't kill itachi. when they fought itachi was hurt or sick, and he died. he never intended on killing sasuke. sasuke didn't know about itachi's past
i don't even think they know each other itachi dies not to long after konans first appearance
Yes, he been knowing since Itachi even came, because he remembered what Sasuke said in the third episode and third chapter in the original Naruto manga. Sasuke said he's wanting to kill a "certain someone", which was Itachi Uchiha.
Yes, as a member of the Uchicha clan, it's very common to know the Fireball Jutsu.