History Unfolds would not exist without the open-data projects below. We are grateful to every contributor who made this work freely available.
| Source | What it provides | Licence |
|---|---|---|
| Cliopatria (Seshat Global History Databank) | Historical political borders through time | CC BY 4.0 |
| Wikidata | Events, rulers, reign dates, coordinates | CC0 (public domain) |
| Natural Earth | Physical base map (land, rivers, lakes) | Public domain |
| Wikipedia / Wikimedia Commons | Event & civilisation descriptions and images | CC BY-SA |
| MapLibre GL JS | The map rendering engine | BSD-3-Clause |
| Open Library & Google Books | Book metadata for the reading lists | — |
Cliopatria is used under CC BY 4.0, which requires attribution. Text and images drawn from Wikipedia and Wikimedia Commons are licensed under CC BY-SA — each click panel links back to its Wikipedia source so credit can be followed to the original article and authors.
Our thanks to all of these projects and the volunteers, researchers, and editors behind them.