Now that I think of it, didn't Valandil, Isildur's 4th son, stay in Rivendell with his mother during the Last Alliance at the end of the Second Age ?
And after Sauron's fall surely Isildur made it clear in Gondor that he was returning to Imladris - why else would he travel north up the Anduin valley ? - and records would surely have accordingly been kept in Gondor of Isildur's intention and Rivendell's location ?
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