In Navarre, the decree written in Navarrese Romance by which the three main population centers (also called the three burghs of Pamplona: La Navarrería, Burgo de San Cernin and Población de San Nicolás) became one is called Privilege of the Union, the Union of the Three Burghs in a single council. Previously, during the Middle Ages, they had functioned as separate administrative entities. The document, signed on September 8, 1423 by King Charles III the Noble, also had the purpose of establishing an agreement that would put an end to the secular disputes between them that it altered, as well as some ordinances that would regulate its operation. By royal order, from then the city exhibited a new banner on and began a new project of defensive buildings, joining the spaces that remained between the burghs with new walls, and eliminating gradually the interior walls. This process gave rise to new streets, such as the one that still bears the name today, Calle Nueva, in the old part of the city. Charles III of Navarre converted it into a Fuero with the rank of law, bringing together the Cortes de Navarra to highlight the act with greater solemnity and swear before them to respect the new legislation in perpetuity. The Pamplona City Council was governed by the provisions of the Privilege of the Union from September 8, 1423 to September 7, 1836, except for the period between March 26, 1820 and September 18, 1823, when it had a City Council. of the government. On January 1, 1837, a new constitutional council formed through a preparatory commission in force since the previous September 8, took office. Historic background To understand the importance of this law, prior knowledge of the historical context in which it was promulgated is essential. Especially tragic episodes such as the War of the Navarreria (1272) which caused the desolation for half a century of the oldest town of Pamplona established around its cathedral. From the Roman municipality to ecclesiastical domain At the beginning of the 11th century, Pamplona was quite depopulated. Then, the king of Pamplona (not yet Navarre), Sancho III the Great (1004-1035) promoted the recovery of the ancient city, the original town −now called Navarrería− continuation of the historical legacy of the ancient Roman city (Pompaelo; the name in Basque, Iruña, which has been documented since the X century). A usual episcopal see, mainly it