The first quarter represents the legendary kingdom of Sobrarbe and the estbalishment of Aragonese liberty. The second, the Cross of Íñigo Arista, represents the Pyrenees and the monarchy. The third has the Cross of St George, with four severed Moors' heads to represent the conquest as Aragon extended into the plains, with tradition stating that the saint helped the Aragonese in the battle. The fourth quarter has the pallets, representing the union of Aragon to the Counties of Catalonia to create the Crown of Aragon, of which they are the coat of arms.
The third quarter has inspired the coat of arms and flag of Sardinia. Aragon ruled Sardinia from in the 14th and 15th centuries.