The snowqueen – Joan D. Vinge – Dell Book – 1981 – Blanda

**The snowqueen**: Arienrhod. As beautiful as she was ancient, she ruled Tiamat, a world linked only by the Stargate to the galaxy-spanning Empire. But soon the Stargate would close, the offworlders and their high technology would be banished, Winter's rule would give way to Summer´s. Arienrhod´s reign -and her artificially prolonged life- would end.