Boris Kalamanos, 1114-1154

found: Vnuk Vladimira Monomakha, 2017:title page (Boris Kalmanovich) page 64, etc. (son of Hungarian king Kalman and Russian Kievan princess Efimii︠a︡, born in Kiev, most likely in 1113; some chronicles have 1114 as year of his birth; lived in Hungary and then Constantinople (probably since 1128); different historical sources have range of years as year of his death: 1151 through 1156)

found: Wikipedia website, viewed 13th June 2017(Boris (Hungarian: Borisz; c. 1114 - c. 1154), also known as Boris Kalamanos (Greek: Βορίσης Καλαμάνος, Russian: Борис Коломанович)[A] was a claimant to the Hungarian throne in the middle of the 12th century. He was the son of Euphemia of Kiev, the second wife of Coloman the Learned, King of Hungary. After Euphemia was caught in adultery, Coloman expelled her from Hungary and never acknowledged that he was Boris's father. However, Boris, who was born in the Kievan Rus', regarded himself as the king's lawful son. He laid claim to Hungary after Coloman's firstborn and successor, Stephen II of Hungary, died in 1131. Boris made several attempts to assert his claims against Kings Béla II and Géza II with the assistance of Poland, the Holy Roman Empire and the Byzantine Empire, but failed and was killed in a battle)