Answers are islands in Europe and the Mediterranean.
9. It sounds rather colourless (5)
17. This has a place in charm and romance (3) - could this be Man - as in Isle of Man. I'm doubtful as it is not referred to as Man!
25. This is at the heart of historical dynasties (5) - have seen this suggested as Caldy - but its actually Caldey
If thats right for 9 then I'm right for 17. Would not have got that as all the others are names in their own right - these answers are shortening names.