Don Pedro Comnenos - Don Pedro is Son of Isaac Komnenos?

I was following the father to son lineage in The Peerage and it lists Don Pedro as "Don Pedro Comnenos". It lists his father as Isaac Comnenos, M, #212063, saying "Isaac Comnenos died in 1061 at Constantinople, TurkeyG.1". There is an "Isaac I Komnenos, Byzantine Emperor" on Geni.com, which does not list any Don Comnenos as a son. (Isaac I Komnenos, Byzantine Emperor)

Isaac Comnenos listing:
http://www.thepeerage.com/p21207.htm#i212063

Any known sources to show a connection of the Comnenos and Komnenos families? (from Turkey to Spain, et al).

David