always—became the coat of arms of the new municipality. As some municipalities were created at this time by merging smaller communities, this led in some cases to arms consisting of two parts, each derived from one of the communities. Some new municipalities also lacked historical cities within, and therefore created wholly new coats of arms. Municipalities which carry the name of a city (with a few exceptions—see below) traditionally display a mural crown on top of their coat of arms. While no law forbids other municipalities from using the mural crown, it is customarily reserved for those bearing former city arms. Kalmar was the first to establish city arms in 1247, and Stockholm, Skara and Örebro were also among the first cities in Sweden to establish city arms. As recently as 2007, Härryda Municipality was among the last municipalities in Sweden to replace its logo with a newly registered coat of arms. Municipal arms may not use any colors (tinctures) other than argent, Or, gules, azure, sable and vert. As in other heraldic traditions, the rule of tincture applies and it is the blazon—not the image—that is legally registered. Former city arms The following is not an exhaustive list of the 133 historic cities in Sweden, but a brief list of cities that are notable and bear heraldic significance within the context of Swedish heraldry. Each is listed by the city name, in general chronological order with the approximate year of settlement or city charter. Note that most city arms originated in the Middle Ages as a city seal, and all were registered as municipality (kommun) arms in the 1970s. Sigtuna (990), one of the oldest cities in Sweden, is known for its Viking Age history and rune stones. In medieval times, coins were minted at Sigtuna, and legend suggests it was the royal seat for a time, signified by the crown on its arms. The crown appeared in the city seal in 1311, and carried through to the municipal arms granted in 1971. Blazon: Azure, a crown Or between three mullets argent. Kalmar (1100) has the oldest known city arms in Sweden, depicting a fortified tower (borgtorn) and dating to 1247. The two stars were added by the end of the 13th century, and the arms have remained virtually unchanged to date. Blazon: Argent, a tower embattled gules, with door and windows Or, issuing from a wavy base azure,