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The flag of the Valencian Community and of the city of Valencia, known as Reial Senyera (Valencian pronunciation: [reˈjal seˈɲeɾa], "Royal Senyera"), is the traditional Senyera, composed of four red bars on a yellow background, crowned with a blue strip party per pale next to the hoist with 1/4 of the total length. It was adopted on July 1, 1982. It is an historical derivation of the Senyera, the heraldic symbol of the Crown of Aragon, also used today with few variations in all the former kingdoms and counties which were a part of this crown.

Source: Wikipedia