Commentary
Charles Cawley states his parents are not known in one section, but lists his father as Andronikos Doukas protospatharios and strategos in another
Family
ClaimDetailEvidence
FatherAndronicus Ducas (e981-) [S973]
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SpouseEirene Pegonitissa (e1014-~1066) 
Child +Andronicus Ducas (e1046-1077) [S972] [S974]
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Attributes
ClaimDetailEvidence
GenderMale
NameIoannes Doukas , Caesar [S972] [S973]
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NameJohn [S972]
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NameIgnatios [S972]
name taken as a monk
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NameIoannes Dukas [S974]
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NameIoannes Ducas , Caesar
Nickname: John the Caesar
no source
FatherAndronicus Ducas (e981-) [S973]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 1013 (1008-1018)
 
Marriageabt 1045Eirene Pegonitissa (e1014-~1066) [S972] [S973]
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Title1073Emperor [S972]
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Flourished1076 [S972]
became a monk
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Title1081Imperial Counselor [S972]
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Deathabt 1088 [S972]
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Sources
IndexTitle
[S972] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Byzantium 1057-1204)" (2006-7 (v1.4 Updated 23 September 2007)) (https://fmg.ac/Projects/MedLands/BYZANTIUM 10571204.htm).
[S973] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Byzantium Nobility)" (2006-7 (v1.2 Updated 23 September 2007)) (https://fmg.ac/Projects/MedLands/BYZANTINE NOBILITY.htm).
[S974] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Bulgaria)" (2006-7 (v1.1 Updated 22Jun 2006)) (https://fmg.ac/Projects/MedLands/BULGARIA.htm).