The Issorium or Issorion (Ἰσσώριον; Issṓrion), or Mount Issorion, was a hill on the northern city border of Sparta, possibly the heights known today as Klaraki.[citation needed] On it was a sanctuary and temple to the goddess Artemis or Diana, in which context the goddess was surnamed Artemis Issoria.[1][2] (Or, from the nearby[1] Laconian town of Pitane, Artemis Pitanata;[1][3] or Artemis Limnaea.[1])
During the Theban–Spartan War, circa 370 BC, the Issorium was seized by a group of Spartan mutineers; Agesilaus II broke up the conspiracy and had fifteen of the mutineers put to death.[4]