Burgundian Netherlands 
 Spanish Netherlands 
 The Seven Noble Houses of Brussels (also called the Seven Lineages or Seven Patrician families of Brussels; French: Sept lignages de Bruxelles, Dutch: Zeven geslachten van Brussel, Latin: Septem nobiles familiae Bruxellarum) were the seven families or clans whose descendants formed the patrician class and urban aristocracy of Brussels, Belgium.
 They formed, since the Middle Ages, a social class with a monopoly, on the civil, military and economic leadership of the urban administration. This institution existed until the end of the Ancien Régime. However, as of the urban revolution of 1421, the representatives of the Guilds also exercised similar offices. Still, the offices of aldermen and captains of the urban militias were always reserved exclusively for members of the Lignages.
 The long lived and rarely threatened supremacy of the Seven Houses of Brussels was based on a multitude of common interests they shared with the ducal dynasty of Brabant, as well as the successive Houses of Louvain, Burgundy and Habsburg. Together with the Guilds of Brussels, they formed the freemen of the city.
 The seven families were first named in a document from 1306 in which John II, Duke of Brabant restores and asserts the existing privileges of the seven families after the citizens of Brussels had violently demanded participation in the city's government.
The families named in the document are:
 All the members of the city council were exclusively recruited and elected from the families who could prove patrilinear or matrilinear descent from the original seven families. However, tradesmen formed the Nations of Brussels to counter this oligarchical system and in 1421, after violent confrontations, gained some political rights. The rule of the Seven Houses remained predominant until the end of the Ancien Régime, when these special privileges were definitively abolished, along with those of the Guilds. This meant the end of this aristocratic system of government.
 Membership and descent of the seven families was carefully recorded in special registers. Applicants needed to provide genealogical evidence that they were descendants of one of the Seven Noble Houses. In addition they needed to be citizens of Brussels, adult, male, catholic, and not earn a living through a trade; instead they were expected to live off the interest of their wealth. Illegitimate children were excluded. Since these criteria were very stringent, few men were accepted to the ranks of this particular patriciate.
 Members of the Seven Houses were responsible for defending the gates and city walls of Brussels. Starting in 1383, each House had the task of defending one of the seven gates of the Brussels wall along with a section of that wall. Houses could also use this gate (tower) to imprison members of their own House who had engaged in blameworthy conduct. In 1422, following the bloody events of 1421 that led to a new balance of power between the Brussels patriciate of the Seven Houses and representatives of the trades that will then constitute the Guilds or Nations, this defence of the gates and walls was shared
 In addition to their judicial, administrative and military functions, the Seven Noble Houses of Brussels were also benevolent and concerned about the needs and well-being of the population.
 Thus, the urban administration created an administrative relief service for the indigent, called the "Supreme Charity", whose masters-general were chosen only among the members of the Houses at the end of their offices in the urban magistracy.
 Between the 12th and 18th centuries, the magistrates of the Noble Houses of the city of Brussels founded numerous official institutions, including schools, orphanages, pilgrim hostels, infirmaries and almshouses.
 Alongside this, members of the Houses have also had, over the centuries, in their personal capacity, important private charitable activities and created many foundations and hospitals to relieve the misery of the population or members of the Houses that had fallen into poverty. These private foundations continued to exist until the end of the Ancien Régime and were after the French Revolution grouped in the Hospices Réunis, that still exist today.
 Among these charitable foundations founded in a personal capacity by members of the Seven Houses, we can mention:
 The annual Ommegang, Brussels' most important lustral procession, celebrated in honor of Our Blessed Lady of the Sablon, the powerful protector of the City of Brussels, is one of the most important moments of the history of the Seven Houses to this day.
 It took place on the Sunday before Pentecost, which was also the day of the festival of the city of Brussels.
 The magistrates and members of the Seven Noble Houses, dressed in red scarlet - the famous Brussels scarlet stained in the blood of a bull - preceded by the magistrate of the statue of the Virgin Mary, participate as they always have, in this sacred procession.
 Were members of the Seven Houses noble? As the historian, editor and genealogist François de Cacamp writes:
 this question does not make much sense since there does not ever seem to have been a legal definition or status of nobility in Brabant, during the period of the national Dukes. Members of the Seven Houses were free men, descendants of free men, and it is more or less certain that in the 12th and even 13th centuries, the notions of freemen and noblemen were almost identical.
During that time, being master and lord of land was being noble in a certain way, and this nobility of blood and land, of social rather than legal character, was transmitted to all children, male and female, by their mothers just as much as their fathers, the same way that land ownership, of which it was the corollary (...this is why) members of the Seven Houses, at least until the 16th century considered themselves, and were considered by others, as nobles, issued from "de nobilibus progeniebus ", "uit adellijke geslachten". Historian and genealogist Christophe Butkens similarly wrote around 1600 that "In this city of Brussels there is an officer of the Duke called Amman and seven aldermen, which have always been elected from the seven patrician families - noble and privileged - in a way that nobody is elected as alderman or magistrate if he is not a descendent, either way, of any of those families."
 Louis Hymans, historian of Brussels, also notes that this nobility was transmissible in the female line. Adages, told by historians, testify that: "the women, in the lineages, ennobled their husbands: Feminœ quia nobiles, etiam maritos nuptiis nobiles reddunt. They brought nobility in dowry: In dotem familiam ac nobilitatem afferunt."
 Nicolas Joseph Stevens concluded that: "even though under the Austrian regime, which in terms of prerogatives devolving to the nobility, we know the essentially formalistic spirit, the quality of Noble was denied to members of the Seven Houses, init is not any less true that they had, by the seniority of their existence and by their services rendered to the City, rights to a certain illustrious standing, which distinguished them from the rest of the bourgeoisie".
 Moreover, even in the Austrian period, in 1743, the description of the city of Brussels published by George Frix reads: "These Noble families called Patrician are those of Steenweghe, Sleews, Serhuyghs, Coudenbergh, Serroelofs, Swerts and of Rodenbeeck; whose descendants subsist still encore without having derogated from either the nobility or the virtues of their ancestors. Numerous rulers of Brabant among which I will cite John II and Charles I, recognised them as illustrious and wise in authentic charters of 1360 and 1469 where they gave titles of Chevaliers (Knights), Ecuiers (squires) and of d'Amis aux Sujets de leur tems (Friends to the Subjects of their tems) issued from these Noble families" and he continues "The privilege particular to these Noble families is worthy of remark. The women carry the name and the rights of their Houses into those they enter through marriage, being Nobles , they ennoble their husbands ; and as daughters of patricians , they give the rank, the quality and all the rights to those they choose as husbands ; in a way that, Patrician families, being very multiplied, gave a high number of subjects to the magistrature". Another half a century later, Aubin-Louis Millin de Grandmaison estimates that: "These families benefited from wide ranging privileges. The most beautiful of all gave women the faculty to pull out of the shadows the families to which they allied themselves. As nobles, they ennobled their husbands, and as daughters of patricians, they gave them rank, quality and all the rights."
 Thus, members of the Seven Houses were originally Nobles and recognised as such undeniably by the inhabitants of the City of Brussels and beyond. But, as Alfred De Ridder writes in 1896 the fact that for members of the Lineages, the women conferred nobility to their husbands and, according to the old saying, "the womb ennobles", damaged the nobiliary principles of the Austrian Netherlands. However, this belief that nobility was only transmitted by men in this region is a grave historical error, as many authors have since shown. Empress Maria Theresa, in Article XIV of her edict of 11 December 1754 "regarding titles and marks of honour or nobility, bearing of arms, coats of arms and other distinctions" tried to give, by law, a definitive solution to this question: it was then forbidden to the Members to give to themselves and their wives titles and marks of nobility: "XIV Those admitted to patrician families or lineages of our cities, will not be allowed to carry swords, or to give themselves or their wives titles or marks of nobility, failure to respect this will result in a fine of 200 florins". Thus, following the entry into force of this edict in the southern Netherlands, the Lineages of Brussels were no longer able, legally, to take advantage of external marks of nobility, although the nobility was not formally denied to them by this edict. On this point, the state of the question remained unchanged in the legal order of the southern Netherlands, for the next forty years, until the abolition of all nobility and the lineage regime of Brussels by the French Revolutionary Power during the invasion of Belgian Provinces. Under the First Empire, Napoleon I gradually recreated from 1804 a new nobility, somewhat similar, all to his devotion and supposed to be a faithful supporter of his regime. The Brussels Houses had no place. Under the United Kingdom of the Netherlands, from 1815 to 1830, with a constitution that gave extensive powers to William I, members of the nobility of each province were united in the provincial equestrian bodies to which were attributed political powers. This is why, following a decree of 26 January 1822 forcing the former nobility to be recognised, only the nobles who were willing to collaborate and to support the policies of King William were recognised. But none of the numerous decrees of King William suggests that all the ancient nobility, even if not recognized by King William, would have been annihilated. Finally, the Belgian Constitution of 1831 made a clean sweep of the Loi Fondamentale of 1815 and therefore also of this decree of 1822. The Belgian National Congress intended to maintain the old nobility and by Article 75 of the Constitution, allowed the King of the Belgians to create new nobles for the future. Nothing distinct was resolved by the National Congress for the Seven Noble Houses of Brussels.
 As can be seen by looking at the List and Arms of the persons admitted to the Lineages of Brussels, if many Brussels Lignagers were, during the Old Regime, legally noble to have been ennobled by the Prince or to descend from the family of which the nobility was legally recognized, the fact remains that all the members of the Noble Houses of Brussels and their descendants enjoyed, at the time, a sui generis legal status conferring on them, in Brussels, in law, important privileges, and indeed, a very high prestige that has continued to this day.
 Concerning representation of the Houses' arms in the following list, the choice was made to use the ones most often admitted. In reality, a personal armorial would be needed as, very often, members of the Houses modified and personalised their arms up to the 18th century, either by adding charges or by changing tinctures, etc. This practice was necessary because of the very nature of this system; there were numerous members of the magistrate who were member of the same house and even had the same family name, thus it was necessary to differentiate arms so as not to confuse them with other members of the family. The study of aldermen seals shows the high number of patrician arms.
 Today, an organization has been formed to bring descendants of the Seven Houses together. This organization plans certain traditional events such as the Ommegang ceremony.
 Descendants of the Seven Houses do not enjoy special political privileges any longer.
 Descendants of the seven nobles house of Brussels are entitled to place the post-nominal initials PB (for the Latin Patricius Bruxellensis) or - in case they hold a title of nobility - NPB (Nobilis Patricius Bruxellensis) after their name. This custom is already found in the writings of Jan-Baptist Hauwaert, NPB (1533–1599).