Goa'uld
Cheops-class Mothership

One of the most powerful Goa'uld ships, these are a used by most System Lords. Good armour and shielding make them a match for a Star Destroyer.

Note: This type of ship is usually referred to as a Ha'tak in Stargate. Our definition came from a mistaken page on the old Showtime site.

External resource: Stargate Wiki

Known Examples:

Keshmari Freedom: Keshmari Navy - Active
Captured by the Keshmari during the Dukhang crisis.

Khufu: Sobek's Domain - Active
One of several warships which attacked Farpoint as it neared completion in 46:10.

Rogue Revenge: Rogue Squadron - Destroyed
Stolen from the Goa'uld and destroyed defending Farpoint in 46:10.