Chronoseer

Data sources and licences

Every point in Chronoseer links to the source it came from. This page lists those sources, the licence each one is published under, and how we credit it. Last checked 4 November 2026.

Event data

Wikidata

26,558 entries · Wikimedia Foundation and the Wikidata contributors · licence: CC0 1.0 (public domain)

Wars, battles, sieges, protests, strikes and other dated events, with their places, dates and links between them. Wikidata's structured data is released into the public domain, so no credit is required. We credit it anyway, and every entry from it carries its Wikidata id.

wikidata.org · Wikidata licensing

Uppsala Conflict Data Program (UCDP)

2,762 entries · Department of Peace and Conflict Research, Uppsala University · licence: CC BY 4.0 (credit required)

Armed conflicts, non-state conflicts, one-sided violence and battle-related deaths from 1946 on, with the death figures each dataset reports. We use version 26.1 of four datasets. UCDP licenses its data under CC BY 4.0 and asks users to cite the publications listed with each dataset:

Davies, Shawn, Therése Pettersson and Magnus Öberg (2026). Organized violence 1989–2025, and violent political protests. Journal of Peace Research. doi:10.1093/jopres/xjag046 (all four datasets).

Gleditsch, Nils Petter, Peter Wallensteen, Mikael Eriksson, Margareta Sollenberg and Håvard Strand (2002). Armed Conflict 1946–2001: A New Dataset. Journal of Peace Research 39(5) (UCDP/PRIO Armed Conflict Dataset, 628 entries).

Sundberg, Ralph, Kristine Eck and Joakim Kreutz (2012). Introducing the UCDP Non-State Conflict Dataset. Journal of Peace Research 49(2) (Non-State Conflict Dataset, 1,222 entries).

Eck, Kristine and Lisa Hultman (2007). One-Sided Violence Against Civilians in War. Journal of Peace Research 44(2) (One-sided Violence Dataset, 510 entries).

UCDP Battle-Related Deaths Dataset v26.1, conflict level (402 entries).

ucdp.uu.se/downloads

Natural Earth (the map)

countries and coastlines at 1:50 million · licence: public domain

The land, coastlines and borders on the map come from Natural Earth, redistributed as TopoJSON by the world-atlas package (ISC licence). Natural Earth is in the public domain, and credit is optional. Made with Natural Earth.

naturalearthdata.com · terms of use · world-atlas

Software and fonts

The map is drawn with MapLibre GL JS (BSD 3-Clause licence). The fonts are Unbounded, Manrope and JetBrains Mono, all under the SIL Open Font Licence.

The archive grows as we add sources. A source appears here only once its data is shown on Chronoseer, and only when its licence allows commercial use.