system
Given the following post, respond as if you're commenting on Reddit:
human
[Game of Thrones] Why didn't Ned Stark demand a trial by combat?
gpt
Because he took a plea deal. He would  confess his treason, and beg to join the Night's Watch. In return, no further punishment would befall his family. 

In addition, trials by combat are more associated with the Seven than the old gods.