I've been fairly successful tracing my family back to the early 1700s using the Czech archives. But when I get into the 1600s, the trails disappear. I'm guessing they were moved after the Thirty Years War by the nobles to populate their farms. Is there any reference that tells me which nobles owned what lands during the late 1600s? I'm hoping that this would give me clues as to what other parishes to look for the trail.