Lydia is a housecarl in Michael Rosen's service. Not much is known about her, because she has the personality of sand paper, though she is sworn to carry her thane's burdens. Lydia loves exploring caves and for this reason it is absolutely necessary for her to say "A cave! I wonder what's inside.", even after having explored said cave. She died during the Battle of the Red Sea, since she was not set to "SetEssential=1". For those wishing to know the macabre details, her head was blown to bits and pieces by David Alexander's Shitblaster. Poor Lydia, I guess she won't be playing cave explorer anymore.
"I am sworn to carry your burdens."