Aldudénië
From Tolkien Gateway
(Quenya for 'lament of the TwoTrees')
A poem lamenting the death of the Two Trees, composed by Elemmíre of the Vanyar, soon after the event. Famous to all the Eldar but not saved.
The name is problemous for the Tolkien scholars, because the sound d doesn't exist in Quenya. It might be some idiom of the Vanyarin.
