Aillen or Áillen is an incendiary being in Irish mythology. He played the harp and was known to sing beautiful songs.
According to The Boyhood Deeds of Fionn, he would burn Tara to the ground every year at Samhain with his fiery breath after lulling all the inhabitants to sleep with his music. This only ended with the arrival of Fionn mac Cumhaill, who inhaled the poison from his spear to keep himself awake and slew Aillen. The act won him the leadership of the Fianna.
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