Ancestors of Isaac Comnenus
At the death of Byzantine emperor John II Komnenos in 1143, the throne passed not to his third and oldest living son, Isaac Komnenos, but his youngest son, Manuel I Komnenos, who successfully claimed the throne.
Isaac nevertheless served amiably as sebastokrator, and his first wife Theodora Kamaterina (d. 1144) bore him a daughter, Irene Komnene, and other children. Irene Komnene married an...