Elrond must have had it from the beginning, after Elendil. I don't remember if Isildur had it at the Battle of the Gladden Fields, but if he did, then he must have given it to his squire Ohtar to take along with the Shards of Narsil to Rivendell. Elrond gave it to each Heir of Isildur upon his coming of age, and so, it probably passed on to Aragorn that way. Once he turned 20, Elrond told him who he truly was, and gave him the shards of Narsil and the Ring of Barahir.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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