She was born Lutheren, but before marrying Czar Nicholas II became Russian Orthodox.
In Germany
The last Russian Tsaritsa/Czarina was Alexandra Fyodorovna.
Alexandra Romanov
Rasputin
Rasputin
Alexei.
Alexandra Fyodorovna.
Tsarina Alexandra Feodorovna's nicknames were Sunny and Alicky
rasputin
Assuming that you are asking who the Czarina Alexandra's, who was not by right or title an actual Czarina but known as the Empress of all the Russias, grandmother was, it was Queen Victoria of the United Kingdom on her mother's side and Elizabeth of Prussia on her father's side.
She was of german decent and so many russians thought she was a spy
rasputin