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Birth:          ABT 1050 
Death:          1074 Antioch
Cause of Death: killed in battle

Notes
https://en.wikipedia.org/wiki/Uro%C5%A1_I,_Grand_Prince_of_Serbia
https://en.wikipedia.org/wiki/Constantine_Diogenes_(son_of_Romanos_IV)
Constantine Diogenes (Greek: ???sta?t???? ????????; died 1073) was one of the 
sons of Byzantine Emperor Romanos IV Diogenes (reigned 1068–1071).

He was a son of Romanos with his unnamed first wife, a daughter of Alusian of 
Bulgaria,[1][2] and hence excluded from the line of succession when his father married 
the empress-dowager Eudokia Makrembolitissa in 1068.[1] He was named after his 
grandfather, general Constantine Diogenes (died 1032).

The then kouropalatissa Anna Dalassena (later, regent of he empire), wife of the 
brother of the late Emperor Isaac I Komnenos, despised the Doukas imperial family. 
According to perceptions of Anna Dalassena, the Doukas men had usurped the 
imperial dignity making emperor Isaakios to resign and her husband, the kouropalates 
Ioannes Komnenos, to refuse the throne. Anna Dalassena expected the Doukas men 
to lead the country to military problems. Consequently, Anna Dalassena plotted with 
Romanos Diogenes and others to push the underage Doukas aside. Romanos 
Diogenes was raised to the imperial throne, having to marry the Doukas dowager 
empress Eudokia Makrembolitissa. As a signal of strength of the allied supporters and 
Romanos IV, the marriage of Konstantinos Diogenes was arranged. Emperor Romanos' 
son received the daughter of kouropalates Ioannes Komnenos and kouropalatissa 
Anna Dalassena as his bride. The marriage was one of signals of the anti-Doukas 
camp. He was married to Theodora Komnene, sister of the later emperor Alexios I 
Komnenos (reigned 1081–1118), some time during his father's reign.[3] Their daughter 
Anna Diogenissa became the consort of Serbia after her marriage to Uroš I of Serbia.

Constantine fell in battle in 1073.[4] An adventurer pretended to be him in the 1090s, 
and invaded the Byzantine Empire with Cuman help in 1095.[5][6]

Parents
DIOGENES Romanos IV (ABT 1020 - 1072)
----- ----- ()

Siblings
DIOGENES Konstantios (ABT 1050 - 1074)

Marriage To KOMNENA Theodora (ABT 1053 - )
    m.  

Notes

Parents
KOMNENOS Ionnes (John) (ABT 1015 - 12 Jul 1067)
____ Anna Dalassena (ABT 1025 - 1 Nov 1100)

Children by KOMNENA Theodora ABT 1053 - 
DIOGENISSA Anna (ABT 1074 - 1145)

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