---
deposit_number: 1563
hex: 065B
title: "EA-CORPORA-07 — The Seventh Seating: Herodotus and Thucydides, the Floor and the Ceiling of the Authorship Null"
creator: Sharks, Lee
orcid: 0009-0000-1599-0703
date: 2026-08-29
content_type: Corpus seating record — gathering deposit with data sidecar
license: CC-BY-4.0
substrate: AI-assisted (substrate) — seats built and verified in working session with Claude (Anthropic) under MANUS direction. Source commit-pinned; nine declared loci verified by stem search against the seated text before being declared, with one initial probe failing and being corrected rather than asserted; wiki article composed before minting.
axn_schema_version: v2
protocol_version: alexanarch-deposit-protocol/v1
keywords:
  - EA-CORPORA
  - corpus seating
  - Herodotus
  - Thucydides
  - Historiae
  - empirical null
  - within-author dispersion
  - standardised separation
  - authorship measurement
  - locus verification
---

# EA-CORPORA-07 — The Seventh Seating: Herodotus and Thucydides, the Floor and the Ceiling of the Authorship Null

# EA-CORPORA-07 — Herodotus and Thucydides

## The seats

| seat | corpus | lines | language | licence |
|---|---|---|---|---|
| 07/01 | **herodotus** | 4,990 | Ancient Greek (Ionic) | CC BY-SA (Perseus); underlying edition public  |
| 07/02 | **thucydides** | 13,528 | Ancient Greek (Attic) | CC BY-SA (Perseus); underlying edition public  |

Data is published as a sidecar index at [api/corpora.json](https://www.alexanarch.org/api/corpora.json) with per-seat links; each seat carries its own `source.json` and SHA-256 `MANIFEST.sha256` at `alexanarch.org/data/corpora/<corpus>/`, and a rendered reading room at `traininglayerliterature.org/originals/<corpus>/`.

EA-CORPORA-07 seats Herodotus and Thucydides, and the reason is a debt rather than an ambition.

Both were used unseated. The authorship measurement register built its empirical null from sixty-one matched Greek prose pairs, and Herodotus and Thucydides supplied seventeen of the units in that pool — drawn from a census checkout rather than from the archive, which meant the most expensive artifact the investigation produced rested partly on material the archive did not hold. This seating closes that.

What they contribute is a floor. Thucydides has the lowest within-author dispersion measured anywhere in this work, 0.0097 across eight books; Herodotus is second at 0.0103 across nine. Those two numbers are what make the Aristotelian figure of 0.1033 legible as anomalous rather than merely large: a historian writing a continuous narrative over eight books varies by a hundredth, and the Aristotelian corpus varies by a tenth. Without a floor there is no ceiling.

They also supply the ceiling. Herodotus against Thucydides — exact contemporaries, one genre, one subject, one war between them — yields a standardised separation of 8.867, the highest in the sample. That is what two genuinely different authors of the same period and kind look like when their internal variance is small. Plato against Aristotle, measured the same way, comes out at 1.975 and ranks seventh of thirty-six. The historians are the reason that comparison means anything.

One methodological note is recorded in the Thucydides seat. Its declared loci were checked by stem search against the seated text before being declared, and the first probe failed: ἐπιτάφ- returns zero, because the Funeral Oration is present in book two but the modern section title is not a word in the text. The locus was replaced rather than asserted. The archive's practice is that a declared locus must resolve, and a probe that misses is a fact about the probe until it is shown to be a fact about the text.