Question: What is the date of death of Konstantin Of Rostov's mother?
Sentence (from "Maria Shvarnovna"): 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").
Relevant evidence: Yes