He was the eldest of the four sons of Vladimir Glebovich of
Ryazan. He is first mentioned in 1195, when he attended the wedding of
Konstantin Vsevolodovich. The following year, he sided with his father-in-law,
Davyd Rostislavich and participated in the campaign against
Chernigov and narrowly escaped capture. In 1207, together with his brother Oleg, he slandered his uncles Roman and Sviatoslav Glebovich before
Vsevolod the Big Nest. In response, his uncles were arrested and imprisoned. He also took part, together with Vsevolod, in the sacking of
Pronsk. The following year, he and his brothers marched to Pronsk against
Davyd Yuryevich of
Murom, who was forced to flee. Gleb and his brother Oleg received Pronsk, but Gleb was not satisfied with this arrangement. In 1209, he decided to add Ryazan to his possessions as well, but this undertaking failed. In a bid for the throne, in 1217 he lured his brothers to a feast at Isady and executed them all, using
Cuman mercenaries. Ousted by popular revolt, he was exiled to the
Wild Fields. In 1218, he unsuccessfully besieged Ingar Ingarovich in Ryazan and fled to the steppe again in the following year. He soon died, after going insane. ==In popular culture==