Painting of Empress Sissi attributed to unknown Spanish painter. National Museum of Moldova considers Federico Ruiz from Madrid as the author of a portrait of Isabella of Bavaria looted from a Romanian museum by the Soviet army.

Despite the doubts of several experts, the painting was restored in 2018. The painting suffered the war ups and downs of the 20th century. It belonged to Carol and Therese Flamman, a Romanian Jewish couple who donated it in 1941 to the Samuil and Eugenia Ionet Ethnographic Museum.