“As the year drew to a close, winter returned to Westeros with a vengeance. On the last day of the year, snow began to fall upon King’s Landing, and a crust of ice formed atop the Blackwater Rush. The snowfall continued off and on for the best part of a fortnight, by which time the Blackwater was hard frozen, and icicles draped the roofs and gutters of every tower in the city.
As cold winds hammered the city, King Aerys II turned to his pyromancers, charging them to drive the winter off with their magics. Huge green fires burned along the walls of the Red Keep for a moon’s turn. Prince Rhaegar was not in the city to observe them, however. Nor could he be found in Dragonstone with Princess Elia and their young son, Aegon. With the coming of the new year, the crown prince had taken to the road with half a dozen of his closest friends and confidants, on a journey that would ultimately lead him back to the riverlands.
Not ten leagues from Harrenhal, Rhaegar fell upon Lyanna Stark of Winterfell, and carried her off, lighting a fire that would consume his house and kin and all those he loved—and half the realm besides.” (WOIAF)
Rhaegar and Lyanna disappeared shortly after the new year of 282 AC, not long after the Tourney of Harrenhal.