My great grandfather was George Harrach born in Breslau Germany, his father was Peter who lived in Breslau, and his father was Count Johann Karl Harrach (or Count Karl Harrach) who also had a brother Maximilian (plus 7 other siblings). And their father was Karl I, Count Harrach-Rohrau-Purchtenstein. Our problem is that we can't find any records saying that Count Johann Karl Harrach (or Count Karl Harrach) had any children AT ALL. Some records show that he died in the 30 years war with his brother-both were officers in the Knight's academy in Gitschin-in the armies of Wallenstein. How can we track down records that will help us?