Maria Shvarnovna (c. 1158 - 19 March/19 May 1205/1206) was the first wife of Vsevolod III "Big Nest", and gave birth to at least 14 children (hence Vsevolod's sobriquet of "Big Nest"). Four of her sons, Konstantin, George, Yaroslav and Sviatoslav, succeeded their father as Grand Princes of Vladimir, and Yaroslav went on to become Grand Prince of Kiev around the time of the Mongol Invasion. As Yaroslav's mother, she is thus the paternal grandmother of Alexander Nevsky, whose son, Daniel of Moscow, founded the Muscovite branch of the Rurikid Dynasty.
Maria's origins are disputed. Some sources say she was Ossetian or Alan and connected to the Georgian royal house, while others, such as the Uspensky Sbornik (a 13th-century text now housed in the Russian State Museum in Moscow), say she was Moravian. M. V. Shchepkina posited the idea that the Sbornik was compiled for Maria in 1199-1206, and thus the claims that she was Moravian might be more believable than the other claims, but Caucasian chronicles claim Vsevolod traveled to Tbilisi in 1170 (from Constantinople), where he was married to Maria at the suggestion of the Georgian King. The date of her death is also uncertain, as 19 March 1205 is also given in some accounts. The Novgorod First Chronicle mentions her death under the year 1205, but does not give an exact day. As it is mentioned after her son Konstantin's arrival in Novgorod on March 20, it would seem she died after that, perhaps in May.