As the Byz in DW I did the classic first action of move next to Jannina (Epirus), wait for Naples to declare war then declare myself and move in to start the siege before Naples gets there. I took Janinna and went to annex and I am not allowed to. Game says that I can't annex until I own all the provinces and my war score is 2%. For the life of me I can't find any other provinces Epirus owns, there are no indications of any vassal or national unions etc. I am stumped, any ideas what may be going on?