The Alexiad of Anna Comnena @ House of Ducas Genealogy Table, no title, s of Ioannis Dukas
Caesar, no mother
The cited information was published by orig. written ca. 1148, English trans. by E.R.A. Sewter, 1969,
Penguin Books, New York, NY (Ref: House of Ducas Genealogy Table, no title, s of Ioannis Dukas
Caesar, no mother) The author/originator was Anna Comnena.