Fredrick William was born in Berlin to Fredrick I of Prussia. The father of Fredrick successfully got the title king from the Holy Roman Emperor and now this newly founded kingdom was succeeded by Fredrick William I.
Maria held the following titles: Austria, Hungary, Croatia, Bohemia, Transylvania, Mantua, Milan, Lodomeria and Galicia, the Austrian Netherlands and Parma. Plus by marriage, she was Duchess of Lorraine, Grand Duchess of Tuscany and Holy Roman Empress.
Catherine came from German heritage. She had a disturbing childhood, but her family pulled the right strings, and along with the help of Fredrick the great she was soon to be marrying the future King of Russia, Peter III.