This is the immediate antecedent of the existing marathon event and should cascade into it rather than stand alone.此为既有 marathon 事件的直接前因，宜作级联而非孤立条目。
The accounts记述 · the ancient witnesses
Greek historians · 希腊史家
Herodotus — Histories （希罗多德·历史）primary source · 源典
§ 6
Hdt. 6.48–49 — the heralds demanding earth and water; many islanders and Aegina give them, and the Athenians appeal to Sparta, which begins the Cleomenes–Demaratus crisis of Hdt. 6.50–93希罗多德 6.48–49——使节索取土与水；许多岛民与埃吉纳人予之，雅典人诉于斯巴达，遂启 6.50–93 所述克莱奥墨涅斯与德马拉托斯之争
Provenance: “primary source” = curated canonical witness (editorial); “dated witness” = derived from the ToposText date index by year-span, with the matched loci count. Sparse counts may include incidental mentions.出处：「源典」为校订之正典见证（编辑判断）；「系年见证」由 ToposText 系年索引按年代跨度推得，附匹配条目数；稀少者或含偶涉。
On the timeline时间轴上
→ See this and all 18 historians on the chronology spine于编年脊柱上一览本事件与全部 18 位史家