[Source] False Ciri was a girl of roughly the same age and somewhat similar appearance as Ciri. Because of this, she was abducted and taken back to Nilfgaard. Spoiler warning: Significant plot details follow.The emperor knew immediately that she was not Ciri, but decided that the people of Nilfgaard should remain none the wiser. He sent her off to the farthest reaches of the empire while he continued his search for the real Ciri. In the end, Emhyr grew to love her anyway, so she remained. Significant plot details end here.