The Nassau family is a prominent European royal family originally from the region of Nassau in present-day Germany. They have played significant roles in the history of various European countries, particularly in the Netherlands and Luxembourg. The family has produced several notable figures, including monarchs and military leaders. The most famous branch of the Nassau family is the House of Orange-Nassau, which has been the ruling house of the Netherlands since the 16th century. Members of this family, such as William of Orange, have been influential in shaping Dutch history and governance. Today, the current monarch of the Netherlands is King Willem-Alexander, a member of this illustrious family.