An Athenian decree concerning an alliance with Segesta in western Sicily. Preserved on a marble fragment from the Athenian Acropolis, written stoichedon. The dating crux at l. 3 — the archon's name has lost all but its final iota — has anchored a longstanding debate over mid-5th-c. Athenian chronology: Habron (458/7 BCE) vs Antiphon (418/7 BCE). The restoration is purely formula-driven (the slot is the conventional archon-eponym dating-slot of the Athenian decree prescript) but the choice of archon shifts the inscription's date by 40 years and the political context with it.雅典与西西里塞格斯塔结盟决议。残碎大理石出自雅典卫城，按 stoichedon 体例镌刻。第 3 行执政官名仅余末尾 iota，由此而生雅典中五世纪纪年之久议：取 Habron 则定为公元前 458/7 年，取 Antiphon 则下移至 418/7 年。修复全凭体例之公式（雅典决议起首皆有执政官年号一槽），然年代之差几近四十载，所涉政治脉络迥异。