The Palace of Tau is a historic palace located in the city of Reims, in northeastern France. It is a UNESCO World Heritage Site and one of the most important historical buildings in the region.

The palace was built in the 12th century and served as the residence of the Archbishop of Reims. It is named after the Greek letter "tau," which was the shape of the building when viewed from above. Over the centuries, the palace was expanded and renovated several times, with significant additions made in the Gothic and Renaissance styles.

The Palace of Tau played a major role in the coronation ceremonies of the Kings of France. It was the traditional site for the pre-coronation banquet and the place where the new king would spend the night before his coronation at Reims Cathedral. The palace also housed the crown jewels and other royal treasures.

Today, the Palace of Tau is open to the public as a museum. Visitors can explore the historic rooms and halls, which are filled with works of art and artifacts from the palace's long history. Highlights include the Salle du Tau, a grand hall used for banquets and receptions, and the Gallery of Kings, which features portraits of the kings of France.

The palace also has a beautiful garden, with manicured lawns, ornamental fountains, and a variety of flowering plants and trees. The garden is a popular spot for visitors to relax and enjoy the peaceful surroundings.