The feast day of St. Quirinus of Neuss is celebrated on January 17 each year. St. Quirinus was a Christian martyr who lived in the 3rd century and is known for his dedication to the faith. He is particularly venerated in the city of Neuss, Germany, where he is considered the patron saint. During this feast day, various religious observances take place, including Mass and prayers in honor of St. Quirinus. His life and martyrdom serve as an inspiration for many, emphasizing themes of faith, courage, and perseverance in the face of adversity.