I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "According to heraldic sources 1,600 is a total estimated number of all legal ennoblements throughout the history of Kingdom of Poland and Polish-Lithuanian Commonwealth from the 14th century onward (half of which were performed in the final years of the late 18th century)."? 

Many what happened?