Toppan Printing set it as the day to promote pizza as a symbol of Italian culture in 1995.
The Pizza Council, which was formed with the aim of developing the pizza industry, has also set "Pizza Day."
The date is from the birthday of Margherita, the wife of King Umberto I of Naples, who gave the name of Pizza Margherita, the prototype of pizza.
Queen Margherita works on arts and culture support and philanthropy, and she is known by the Pizza Council as "Madre D, Italia" (Mother of Italy).
When she visited Naples in 1887, a local pizza maker presented a pizza with the image of the Italian flag using tomatoes (red), basil (green) and mozzarella cheese (white).
What her queen liked so much was the beginning of Pizza Margherita.