The flag of the Valencian Community and of the city of Valencia, known as Reial Senyera (Valencian pronunciation: [re'jal se'?e?a], "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 spear with 1/4 of the total length. It was adopted on July 1, 1982.
As many other flags of medieval origin, the Senyera, or "Senyal Reial" (royal ensign), was used in those years as the arms of the King of Aragon. While not existing still in the Middle Ages, the concept of national flag as understood today, the true symbol of the nationality was constituted on the royal shield.
It is traditionally considered that a Senyera was granted by James I of Aragon as the arms of Valencia following the Christian conquest from Moorish rule in 1238, although the earliest sources related to this are dated in 1377, when the City Council agreed to replace the old arms used for seals with a new one with the Senyera. While the origins of the usage of the Senyera as a coat of arms remain unclear in the agreement, a crown in the helm and two "L" as supporters were added, according to an honour awarded by Peter IV of Aragon for the loyalty and courage shown by Valencians to him in several wars such as the War of the Two Peters against the Kingdom of Castile.
This Valencian coat of arms began to be used in textile standard as a pennon, including the crown in a fringe, although the blue colour was slightly different. It was bipartida, meaning two swallow tails, or abocellada, that's only one swallow rounded and higher tail. The latter is one of the two shapes used and officially regulated today, together with the rectangle, for Valencian municipalities.
The only currently preserved pennon, commonly considered a copy of the original, was made in the 17th century and is kept, though very damaged, at the City Historical Archive of Valencia.
coleccion=iberlex&ref=1985/01806&anyo=1985&nbo=23&lim=A&pub=BOE&pco=2256&pfi=2262 Boletín Oficial del Estado number 164]: Article 5, 1: "The traditional flag of the CV is made up of four red stripes on a yellow field crowned over a blue band by the hoist." 2. "A Law of the Cortes Valencianas [the autonomous parliament] may determine the heraldical symbols of the Community which shall contain those [arms] of the provinces of Castellón, Valencia and Alicante, and its incorporation to the flag over the stripes". The drawing uses a ratio of 2:3. The precious stones are -E-S-E-S- (E: emerald or green oval; S: sapphire or blue quatrefoil; each hyphen would represent a pearl or white circle), from bottom hoist to top. The width of the blue band (including the thin red stripe carrying the jewels) is about 1/5 of the fly. Also quoted here</ref> There are no official proportions specified, but two ratios, 1:2 and 2:3, are being used.
The flag of Valencia is to be hoisted both outside and inside of each and every public and civil building of the Valencian Community, without endangering the prominence and most honorable place of the Flag of Spain. It has to be hoisted at the right of the National flag (left from viewer's point). The Flag of Valencia can't be bigger than the Flag of Spain nor smaller than the flags of other entities.