The House of Nassau is a European royal house that originated in the 11th century in the region of Nassau, now part of modern-day Germany. It gained prominence through various branches, including the House of Orange-Nassau, which played a significant role in the history of the Netherlands. The house has produced many notable rulers and has been influential in European politics. Throughout its history, the House of Nassau has been associated with various territories and titles, including the Grand Duchy of Luxembourg and the Principality of Nassau. Members of the house have also held significant positions in other countries, contributing to its legacy in European nobility.