Ruler · 1187 – 1247

Konrad I of Masovia

Lived 1187 – 1247; politician. Duke of Masovia of Duchy of Masovia, 1194 – 1247; also in the line of Kingdom of Poland.

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

Lived: 1187 – 1247; 60 years
In office: 53 years; one reign
Lines: 2; states
Left it: ending not on record; nothing on record

Duke of Masovia

Duchy of Masovia · the 5th of 7 dated reigns · 1138 – 1503

1 before

Leszek, Duke of Masovia1173 – 1186

Casimir II the Just1186 – 1194

Leszek I the White1194 – 1200

Konrad I of Masovia1194 – 1247

Siemowit I of Masovia1248 – 1262

Janusz III of Masovia1503

ending not on recorda second row: a reign that began before the last had ended — rival claimants, or a shared thronethis entry

Reigned 1194 – 1247 · 53 years

Came to it: the sibling of the ruler before, on record
Left it: ending not on recordnothing on record: no death date to read the end against

Also in the line of Kingdom of Poland (15th of 30).

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Konrad I of Masovia in the atlas: the article, every line they sat in, and the map in their years.
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Wikidata Q53460 (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.