In 1889, Queen Margherita of Savoy reportedly grew tired of the rich, elaborate food served at court and asked to try a simple local dish while visiting Naples. A local pizzaiolo prepared a pizza topped with tomato, mozzarella, and basil—chosen to represent the red, white, and green of Italy’s newly unified flag.
######################
A popular legend holds that the archetypal pizza Margherita was invented on 10 June 1889, when the Royal Palace of Capodimonte commissioned the Neapolitan pizzaiolo Raffaele Esposito to create a pizza in honor of the visiting Queen Margherita. Of the three different pizzas he created, the queen strongly preferred a pizza swathed in the colours of the Italian flag—red (tomato), white (mozzarella), and green (basil).[9] Supposedly, this type of pizza was then named after the queen,[10] with an official letter of recognition from the queen's "head of service" remaining to this day on display in Esposito's shop, now called Pizzeria Brandi.[11]
The ingredients of traditional pizza Margherita—tomatoes (red), mozzarella (white), and basil (green)—are held by popular legend to be inspired by the colours of the national flag of Italy.[12]
Later research cast doubt on this legend, undermining the authenticity of the letter of recognition, pointing out that no media of the period reported the supposed visit and that both the story and name Margherita were first promoted in the 1930s–1940s.[13][14]
https://en.wikipedia.org/wiki/Pizza_Margherita#:~:text=The%20origins%20of%20pizza%20Margherita,to%20the%20toppings%20already%20present.