Harmonia
daughter of Gelon, the son of Hieron II., king of Syracuse. She was married to a Syracusan named Themistus, who, after the death of Hieronymus (B. C. 215) was elected one of the captains-general of the republic; but these being soon overthrown by a fresh revolution, in which Themistus perished, a decree was passed condemning to death all surviving members of the family of Hieron; and, in pursuance of this barbarous resolution, Harmonia was immediately put to death, together with Demarata and Heraclea, the daughters of Hieron. (Liv. 24.24, 25; V. Max. 3.2. ext. § 9.)
From William Smith (ed.), Dictionary of Greek and Roman Biography and Mythology. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.