Computer database located in the city of Atlantis, containing various information on the city and the Ancients who once inhabited it. The database includes a complete record of Ancients who returned to Earth following the first Siege of Atlantis (including Merlin) and the sinking of the city.

KEY EPISODES

Avalon, Part 1 - Daniel skims through the Ancient database and recognizes a familiar name.
Air, Part 1 - The Icarus Base successfully connects to a 9-chevron Stargate address, discovered two years earlier in Atlantis's database.