Waltrude (Waudru or Waldetrudis) is the seventh-century patron saint of the city of Mons, Belgium. She is responsible for the city's birth and flourishing. Mons was the European Capital of Culture in 2015.

There are six legends that are attributed to Waltrude that span three hundred years.

A festival listed as a Masterpiece of the Oral and Intangible Heritage of Humanity by the United Nations Educational, Scientific and Cultural Organization (UNESCO), it takes place every Trinity Sunday in the city of Mons. It has been continuously celebrated since the 1300s because of miracles attributed to Waltrude. It is sometimes simply called the Doudou.

WALTRUDE is a science fiction game filled with devils and dragons, ancient heraldry and ancient people, and great distances between time and place. The characters, designs, and settings all have elements in the folklore and history of Belgium as far back as the seventh century. From the bubonic plague to the French Revolution, immerse yourself in a rich and vibrant vision spanning over one thousand years of European history through the lens of a space odyssey.