An ancient starship, the Dreadnaught was first manufactured prior to the Clone Wars by Rendili StarDrive, and employed by the Old Republic. These ships required a huge number of crewmembers (16,000+) to run. They were about 600 meters in length, with a roughly cylindrical shape. The basic idea behind the dreadnaught is that it can deployed to maintain a planetary occupation. Six weapons blisters were arranged around its midsection, and it had a clamshell-shaped bow. They have been rated to speeds of .4 past lightspeed, with a top speed of 14 MGLT. The Dreadnaught is armed with 10 turbolaser batteries, 20 quad laser cannons, 10 laser cannons, one warhead launcher, 160 SBD shields, and a 80 RU hull. -Source: Unofficial Star Wars Encyclopedia

Despite the Dreadnaught's age, it is still a powerful ship in its own right, and rebuilt and revised models are still in use today by both the Imperial remnant and the New Republic.