"Rumor has it that black dragons dwell in these caverns, which means their treasure is hoarded here as well."
—Heroes IV description
The Dragon City is a creature bank in Heroes of Might and Magic I, Heroes II, and Heroes IV. The similar creature bank in Heroes III and Heroes V is called the Dragon Utopia. It is usually the toughest creature bank in that game.
In Heroes I, it is defended by a small amount of dragons. When the guardians are defeated, the Dragon City grants 1000 gold per day and has a small host of dragons defending it.