[Luthien_ Tinuviel]

I'm thinking Feanor, because:

I travelled long, and never far
From reminders of my great despair.- Feanor travelled from Middle-Earth to Valinor, but the Doom of the Noldor and the Fate of the Silmarils followed him everywhere.

I could not leave them, deeply scarred
Works I devised, and left them there.-Feanor could not leave his Silmarils in the hands of Morgoth, and he was deeply scarred by the death of his father and his Oath. He devised many cunning things, but left them all in Valinor in order to pursue his masterwork: The Silmarils.