A beautiful and quiet Adan woman of the Third House, Aerin (S."Desire of the Sea") was forced into marriage by a swarthy Easterling named Brodda after the Battle of Unnumbered Tears (S."Nimaeth Amoediad"). Aerin aided Túrin and Morwen. Unfortunately, after the enraged Túrin slew Brodda, Aerin revealed to Túrin the place to which his mother had departed; thus, she unknowingly informed Túrin of the gravity of his deeds.