Tessarion, the Blue Queen, was a beautiful young she-dragon of dark cobalt, her claws, crest, and belly scales the color of beaten copper, whose flame burned blue. She had bonded with Prince Daeron Targaryen, youngest son of Viserys I, by 120 AC, and by the outbreak of the Dance of the Dragons she was of fighting weight, though the youngest and smallest of the greens' dragons and only a third the size of Vermithor; what she lacked in bulk she made up in nimbleness.
Daeron rode her to the Battle of the Honeywine in 130 AC, where her arrival turned the day for Lord Ormund Hightower, and thereafter she flew ahead of the Hightower host up the Roseroad, scattering Queen Rhaenyra's loyalists who would not face her fire. She fought at the First Battle of Tumbleton and was left unchained in the camp west of the town. When Addam Velaryon fell upon that camp by night on Seasmoke, Daeron was slain in his tent at the outset, and the riderless Tessarion rose shrieking to meet Seasmoke in the air, vanishing into cloud and falling on him from behind, until Vermithor joined the fight and the three dragons tore at one another over the town. She came down broken beside the Mander, and Lord Benjicot Blackwood had his archers end her suffering with arrows through the eye.