Battletech - Liberator Class Cruiser.

Length - 855 meters
Displacement - 830,000 tonnes
Crew Compliment - 420

The Liberator class cruiser is actually based on the older Avatar class (www.sarna.net/wiki/Avatar_%28W…) When the Avatar's were replaced by the newer and more powerful Luxor Class they went into reserve fleets, training commands or mothballs.  Six of the class survived the Amaris Civil War and went into exile alongside the vast majority of the Star League Defence Force.  Over a century later these six ships were refitted, rebuilt and rearmed and called the Liberator Class in Clan service.

Here you can see the CSJ Korat charging her jump drives with her solar sail deployed in an unknown binary system before she jumped to her final battle in the space around Huntress.

Art by the amazing - mattplog.deviantart.com/