The Djen was a large group of djinn and their slaves and servants led by the powerful djinni Calim. They came to Faerûn from an unknown place around -7800 DR and settled the areas immediately surrounding present-day Calimport. This event was known as "The Great Arrival" and within mere months, they had built a large city, whose spires quickly rose above the trees. The Djen empire lasted nearly two millennia with Calim at its head but its existence was fraught with war, first with marids, then with efreet led by Memnon. The battles with the efreet were particularly destructive.