Mstislav Romanovich Old ( in baptism Boris , about 1156/1162  - June 2, 1223 ) - Prince of Pskov (from 1179 ), Belgorod ( 1206 ), Smolensk ( 1197 - 1212 ), Grand Duke of Kiev ( 1212 - 1223 ). Son of Roman Rostislavich and daughter of Svyatoslav Olgovich ; came from the Smolensk branch of the Monomakhs .
On the political arena came out in 1177, when he and his uncle Ryurik Rostislavich and elder brother Yaropolk shared the fate of the defeat against the Polovtsians in the battle of Rostovets .
In 1178, his father sent him to help Vitebsk prince Vseslav Vasilkovich against Mstislav Rostislavich the Brave . Roman, being the eldest of the Smolensk princes, thus blocked the initiative of Mstislav and the Novgorodians to unleash a war.
In 1185, Mstislav participated in the campaign against the Polovtsians, which ended in a victory at Khorol .
In 1195 , when the Ol'govichi organized a march on Vitebsk and along the way began to ruin the Smolensk lands, Mstislav was sent by his uncle Davydom at the head of the Smolensk army against the Chernigovites. Smolyan hit was a success, but in the rear of the Mstislav regiment the Polotsk citizens beat all the Chernigovites, and the battle was lost, Mstislav was taken prisoner.
After the death of Smolensk prince Davyd Rostislavich , Mstislav Romanovich's uncle, in 1197 , the latter was recognized as a Smolensk prince and annexed the principality of Mstislav to Smolensk , retaining it as an inheritance . In 1212    his cousin Mstislav Mstislavich , who reigned in Novgorod, in alliance with the Smolensk landed on the Kiev prince Ingvar Yaroslavich Lutsky , after the death of which the prince of Kiev became Mstislav Romanovich. Both Mstislav organized a council of Russian princes in Kiev before the first campaign against the Mongol-Tatars. In the main part of the battle on Kalka did not participate, staying on the right bank of the river in a fortified camp. After 3 days the siege of the camp, together with the two Turov-Pinsk princes and 10 thousand soldiers, surrendered under the promise of life and was killed. Prince Vladimir Ryurikovich, who escaped in the battle, became the prince of Kiev.
- Svyatoslav - Prince of Novgorod ( 1218 - 1219 ), Prince of Polotsk ( 1222 - 1232 ), Prince of Smolensk ( 1232 - 1239 ).
- Izyaslav Mstislavich (c1182-c1190)|Izyaslav]]  ?
- Vsevolod - Prince of Novgorod ( 1219 - 1221 ), Prince of Smolensk ( 1239 -?). The novel 
- Rostislav   ?
- Maria (in the monastic life of Agafia), married to the Rostov prince Konstantin Vsevolodovich
- Daughter (name unknown)
|Владимир Всеволодович Мономах|
|Мстислав Владимирович Великий|
|Ростислав Мстиславич Смоленский|
|Инге I Старший|
|Кристина Ингесдоттер, принцесса шведская|
|Роман Ростиславич Смоленский|
|Мстислав Романович Старый|
|Святослав Ольгович (князь черниговский)|
|дочь половецкого хана|
|Мария Святославна, княжна новгород-северская|
|Пётр, новгородский посадник|
|Offspring of Mstislav III Romanovich of Kiev and unknown parent|
|Svyatoslav Mstislavich of Novgorod (c1180-c1238)|| |
|Izyaslav Mstislavich (c1182-c1190)|| |
|Vsevolod Mstislavich of Smolensk (c1185-1249)|| |
|Rostislav Mstislavich (c1188-c1240)|| |
|Agafia Mstislavna of Smolensk (c1190-1221)|