As stated in the Alexiad, when Isaac and Alexios left Constantinople in mid-February 1081 to raise an army against Botaneiates, Anna quickly and surreptitiously mobilized the remainder of the family and took refuge in the Hagia Sophia.
He was the chief source used by Anna Komnene in her Alexiad on her father's battles, and is very favourably portrayed by her in her book as both capable and loyal.
that covered the years 1118-1176, thereby continuing the Alexiad of Anna Komnene, and covering the reigns of John II and Manuel I, up until Manuel's unsuccessful campaign against the Turks, which ended with the disastrous Battle of Myriokephalon and the rout of the Imperial army.