Devon Day, also known as Saint Petroc’s Day, is observed in Devon, a ceremonial county in South West England, every June 4. This holiday coincides with the feast day of Saint Petroc, the patron saint of Devon, who was a British prince and missionary in the 5th century. The day is marked by various events celebrating the history and culture of Devon, reflecting its rich heritage. Devon has a significant number of church dedications to Saint Petroc, more than in neighboring Cornwall, where the saint is also popular. The Devon flag, featuring a white cross outlined in black on a green background, is dedicated to Saint Petroc and was officially recognized by the Devon County Council in 2006. The holiday serves as an opportunity for the local community to engage in cultural festivities, honoring both the saint and the county’s historical significance.