A younger son of Sviatoslav Vsevolodovich, Mstislav is remembered as the ancestor of the Kozelsk princes and as the prince of Chernigov who died at the Kalka in 1223.
His seat in 1200 is not pinned; Kozelsk, in the Vyatichi forest on the Zhizdra, is the usual guess, because his descendants held it.
Who he is
- Name
- Mstislav Sviatoslavich
- Title
- Prince of the Olgovichi; Kozelsk by the later genealogies (not pinned for 1200)
- Since
- Not pinned
- Born
- Not pinned
- Family
- Son of Sviatoslav Vsevolodovich of Kiev; later prince of Chernigov; killed at the Kalka on 31 May 1223; the princes of Kozelsk of 1238 descend from him
- Confidence
- low
The later princes of Kozelsk descend from him; no source we could reach places him at Kozelsk in 1200.
Overlord
Igor, as senior prince.
What it holds
- Kozelsk and the Zhizdra country (not pinned for 1200)
How it was acquired
Not recorded.
Allies and rivals
His brothers Oleg, Vsevolod and Gleb.
Wealth
Furs, honey and wax of the Vyatichi forest.
Military
His retinue.
Threats
- Raids from Smolensk or Vladimir across the Vyatichi forest, as in 1196
Where the sources disagree
Evidence: Inference from the later Kozelsk line; nothing for 1200.
On the map: Low confidence; the ground is the Olgovichi's whoever held it.
Primary sources for Chernigov (the Olgovichi)
Chronicles, registers, sagas and inscriptions written in or near 1200 that cover this entry. Each has its own page with editions, translations and where to read it.
- The Hypatian Chronicle (the Kievan Chronicle compiled about 1200 at the Vydubichi monastery; the Galician-Volhynian Chronicle in the 13th century). The southern record. Read online
- The Laurentian Chronicle (the Suzdal continuation kept in the late 12th and 13th centuries; manuscript 1377). The court record of Vsevolod III of Vladimir. Read online
- The Tale of Igor's Campaign (about 1187 to 1200 (disputed)). A poem on Igor Sviatoslavich's defeat by the Polovtsians in 1185 that addresses the princes of the day by name: Vsevolod of Vladimir, Rurik and David Rostislavich, Yaroslav of Galich, Roman of Volhynia and the Olgovichi of Chernigov, of whom Igor himself was prince from 1198. Read online
Sources and studies
Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.