I need help from an EXPERT, please! What is the best system for researching the various members of the various royal Prussian families. Would the title "COUNT" have been used among any Prussian royalty.

I have been studying Prussia as much and as fast as I can, tracking its growth from circa 1400 through the 1700's and 1800's. I am descended of a Prussian born in Gronia/Gronau. This man was a person of fierce determination, gentleman's manners, personal wealth, and an unwaivering loyalty to his children. He was hugely involved in the recording of his family's history.

I need advice on how to look for a specific gentleman with the royal title of Count. And I don't know where to begin.

Thank you so very much for your assistance in this matter.

Kattieman