When
Gandalf arrived in M-e c. in the year 1000 Third Age,
Cirdan (who welcomed all five of the
Istari at
the Grey Havens, and told only
Galadriel and
Elrond about their arrival) yielded
Narya, the Great Elven
Ring of Fire to him (and not to
Saruman, which rubbed the latter wrong). Now I would think that Galadriel and Elrond, holders (and users, in this time when
Sauron did not have his
One Ring) of the other two Great Elven Rings, would have known of this – even if Cirdan had not told them, which I doubt seriously. Anyone who had been keeping track of Gandalf in any way would have known that by the time of the Long-expected Party, he was about 2000 years old (though for mortals, this would have meant digging in dusty archives).
But I would think for most who knew anything,
Gildor’s words to the three
Hobbits Frodo,
Sam, and
Pippin while they were still in
the Shire, but after the first encounter with
Black Riders, would hold:
“Do not meddle in the affairs of
Wizards, for they are subtle and quick to anger.”
Legolas and
Gimli must have known a bit about Gandalf, both from their dads, so to speak,
Thranduil and
Gloin, from the doings in The
Hobbit. One might assume that Legolas, as crown Prince, might have stayed behind while Thranduil headed off for what was to become the
Battle of the Five Armies (contradicting P. Jackson).
Aragorn had met Gandalf, and their friendship began, in 2956 TA, so he might have come to know, after time, a bit more (possibly from Elrond and Galadriel, his foster father and
Arwen’s father, respectively Arwen’s maternal grandmother). But especially after their meeting with Gandalf as
The White on the borders of
Fangorn Forest, and again after Gandalf ejected Saruman from the order and broke his staff almost casually (both had been present at the
Council of Elrond when Gandalf had recounted his imprisonment by Saruman!), they probably just figured “this is definitely a good thing, but details are probably more than just a little beyond us”. 🤯