Ainion was born in TA 495 in Doriath, his life there was unknown. In FA 506, his parents died during the Sack of Doriath. As he saw Nostariel in pain, he chose to protect her by his magic powers he was able to use by the help of his parents. Oropher brought him with him later on, Ainion met Thranduil. Ainion was somebody important to Thranduil because he was able to cure him from anything. Oropher moved in Mirkwood and etablished his realm during the first years of SA and left Ainion found the Great Assembly of Wizzards of Mirkwood, where all elves who had the gift of magics would be able to train themselves.