C807 would be the title Count of "Province 807". To find the province search for 807 or "id = 807", where the spaces are important. To find members of your court search for "tag =
ytag", where
ytag is your tag. You still need to know some details like name and traits if you want to identify a specific person, though.
The tag search will also bring you to your country definition (laws, slider settings ...) eventually, but if you are looking for that it is best to start from the end of the file.
EDIT: This is kind-of redundant now. Well, you shouldn't get distracted while answering.

o