Method, sources & licences
What this map shows. Each author layer is a conservative extraction of Pleiades place records whose structured bibliography explicitly cites that author/work. It is a Pleiades-linked proxy for an author’s geographic horizon, not an exhaustive reconstruction of every place named, known, or imagined by that author.
Location meaning. Markers are plotted at Pleiades modern representative points. They are not ancient coordinates. A single point can simplify an extended feature such as a river, sea, island, region, or mountain system. Linked records without a representative point are counted in coverage figures but cannot be plotted.
Pleiades. Derived from Pleiades: A Gazetteer of Past Places, © Pleiades contributors, reused under CC BY 3.0. Snapshot: pleiades-places-latest.json.gz, downloaded 28 August 2026. Pleiades recommends numbered archival releases for static scholarly publication. Every Pleiades ID in the app opens the canonical Pleiades record in a new browser tab.
Kassiteros attribution. The Kassiteros selection, author–place reconciliation, compilation and project-authored annotations are © Ben Sumpter, The Kassiteros Project, licensed CC BY 4.0. CSV and GeoJSON exports attach both the Kassiteros citation/licence and the underlying Pleiades CC BY 3.0 source rights to every record.
- CAWM: Consortium of Ancient World Mappers tiles, CC BY 4.0.
- DARE: Digital Atlas of the Roman Empire, Johan Åhlfeldt, CC BY-SA 3.0.
- OpenStreetMap: © OpenStreetMap contributors, ODbL.
- Marker colours encode books/works as a display aid only; they do not encode certainty or importance.