system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune] After House Atreides is wiped out on Arrakis, did anything happen to the Atreides home world Caladan? Was it left defenseless and ripe for conquest?
gpt
The Emperor appointed Count Hasimir Fenring as governor of Caladan while House Atreides take over Arrakis. He was a trusted and loyal servant of the Emperor, so Caladan was "protected" from any possible conquest.

I don't recall whether Caladan and its fate are mentioned later in books.