Imagine a big book with lots of pages and words about people who were very important in Germany a long time ago. This book is called the "Neues Allgemeines Deutsches Adels-lexicon." It's like a big dictionary that tells you about many families who were really rich and powerful in the past.
In this book, you can learn about people who had special titles like "duke," "count," or "baron." These titles meant that they were very important and had lots of land and money. The book also tells you about their family history, like who their ancestors were and what they did.
So, if you ever want to learn about the people who were very important in Germany a long time ago, you can read the "Neues Allgemeines Deutsches Adels-lexicon" and find out!