Ruler · 1138 – 1171

Conan IV of Brittany

Lived 1138 – 1171. Duke of Brittany of Duchy of Brittany, 1156 – 1166.

Wikidata's English label: Conan IV, Duke of Brittany.

For the full story, the article on Wikipedia (CC BY-SA 4.0); this page holds what the record says of the reign.

Lived: 1138 – 1171; 33 years
In office: 10 years; one reign
Lines: 1; Duchy of Brittany
Left it: abdicated; Wikidata's end cause on the term

Duke of Brittany

Duchy of Brittany · the 1st of 4 dated reigns · 1156 – 1203

Conan IV of Brittany1156 – 1166

Constance of Brittany1166 – 1201

Geoffrey II of Brittany1181 – 1186

Arthur I of Brittany1196 – 1203

killed, executed or dead in battledeposed, abdicated, exiled or removeddied in officea second row: a reign that began before the last had ended — rival claimants, or a shared thronethis entry

Reigned 1156 – 1166 · 10 years · came to it aged 18

Came to it: inherited
Left it: abdicatedWikidata's end cause on the term: abdication

Conan also inherited the title Earl of Richmond from his father Alan, which made him subject to both the King of England and the King of France.

Open in the atlas

Conan IV of Brittany in the atlas: the article, every line they sat in, and the map in their years.
Analyse the succession of Duchy of Brittany: every reign, how each ended, and the numbers over them.
States of Europe, and every state with a page.

Wikidata Q338985 (CC0) · the reigns from Wikidata's P39 terms, the rulers' own articles read by grammar (sentences quoted above, CC BY-SA 4.0) and Kokkonen & Sundell where they code the line · data built 2026-10-06 · Pastlas v2.9.1, by Oleh Voronko. The published atlas and its data are for non-commercial use.