Winter Star

From Tardis Wiki, the free Doctor Who reference

Ice-Askar the Winter Star was a cold location famous for its frost fairs. (PROSE: Lungbarrow, AUDIO: Auld Mortality)

In the Age of the Pythias, the Winter Star was the location of a century-long siege by the Gallifreyan Heroes. (PROSE: Cat's Cradle: Time's Crucible)

The Seventh Doctor once mentioned the frost fairs of Ice-Askar to his family as one of the wondrous things he'd seen after leaving Gallifrey. (PROSE: Lungbarrow) Similarly, in one timeline of the Doctor's origins, the Doctor used the Possibility Tree to show Ice-Askar's frost fairs to Susan, noting they were a place where one could "skate through the sky and carve sculptures in the clouds." (AUDIO: Auld Morality)