It was to see the man behind the account.

As a short history to Aachen. Aachen was the seat of the empire of Charlemagne, which influenced the history of Western Europe for a long time. He is also burried there in the cathedral.

That you find documents in French is normal for that time in Europe. Naopleon conquered most of Germany. As a fun fact his 3rd symphonie was entitled at start Eroica - intitulata Bonaparte. He removed the suffix after Napoleon crowned himself emperor.

Enjoy your trip!