What did murtagh you know why nasuada?

Murtagh knew Nasuada because they were both involved in the Varden, a group fighting against the tyranny of the Empire in the Inheritance Cycle book series. Murtagh was the son of the evil King Galbatorix and initially fought on the side of the Empire, but later switched allegiances to support the Varden, where he came into contact with Nasuada, who was the leader of the Varden.