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Unusually for an Agri WorldsWorld, Quintarn is largely desert, but it features several dome-enclosed cities, with vast water traps, capturing moisture from the atmosphere and storing it underground.{{Fn|1a}}{{Cite This}} These cities support arable land and hydroponic cultivation that make Quintarn one of the most productive Agri Worlds in the [[Imperium]], supplying foodstuffs to the rest of Ultramar, and many other planets beyond.{{Fn|3a}}

The Three Planets were captured by [[Ork]] scavangers just after the battle against [[Hive Fleet Behemoth]]. [[Marneus Calgar]] led the forces of the [[Ultramarines]] to reconquer them{{Cite This}}. During the Orkish occupation, a thousand priestesses of the [[Imperial Cult]] chose to hurl themselves to their death from Quintarn's highest mountain, rather than be taken prisoner by the greenskins. In commemoration of their sacrifice, the mountaintop was razed by an [[orbital weapon|orbital bombardment]], and the resulting rock formations were sculpted into a thousand effigies of the priestesses. This monument became known as the '''Maidens of Nestor'''{{Fn|3b}}.

During the invasion of the [[Chaos]] warband known as the [[Bloodborn]] in 854999.[[M41]], Quintarn was invaded by the forces of the [[Dark Mechanicus]] Priest [[Votheer Tark]]{{Fn|4a}}{{Fn3aFn|3a}}.