Anna Anderson claimed to be a lost member of this house.
One monarch from this family ordered the beheading of the brother of his mistress Anna Mons, after which the head was placed on display at his nation's first museum, the Kunstkamera. This house eventually merged with that of Holstein-Gottorp, and its first monarch was living in a (*) monastery when he was elected by the zemsky sobor. Anna Anderson claimed to be a lost member of this house. The Time of Troubles ended after its first monarch Michael ascended to the throne, and it succeeded the Rurik dynasty. For 10 points, name this dynasty of czars like Peter the Great, which ruled Russia from the 17th to the 20th centuries.
One monarch from this family ordered the beheading of the brother of his mistress Anna Mons, after which the head was placed on display at his nation's first museum, the Kunstkamera.
Romanov