Question: What was the pen name of the husband of Grand Duchess Yelizaveta Mavrikiyevna ?
Related documents: [0]  [DOC] Prince Georgy Konstantinovich of Russia (6 May 1903 – 7 November 1938), was the youngest son of Grand Duke Konstantin Konstantinovich of Russia and his wife Grand Duchess Yelizaveta Mavrikiyevna. [END] 
[1]  [DOC] Grand Duke Konstantin Konstantinovich of Russia (Russian: Константи́н Константи́нович ; ] ; 22 August 1858 in Strelna – 15 June 1915 in Pavlovsk) was a grandson of Emperor Nicholas I of Russia, and a poet and playwright of some renown. He wrote under the pen name "K.R.", initials of his given name and family name, Konstantin Romanov. [END] 
Answer: 
"K.R."
"K.R."