The territory of San Giorgio su Legnano is located at the northern edge of the Po Valley, south of the Alpine foothills.

Then, due to the various economic crises that followed in the decades of the 20th century, a new phase began that led to the closure of many companies with the consequent birth of many brownfield areas, many of which were recovered.

[9] Due to its location in the upper Po Valley, San Giorgio su Legnano has a Continental climate with cold winters characterized by many days of snowfall and fog.

[18] In the Middle Ages, the community of San Giorgiowas known as "Sotena" or "Sotera", as can be read in some parish archival notes that refer to a medieval repert.

The first reference to Saint George in the name of the village appears on documents from the early 15th century, which indicate the community as locus Sancti Georgi Plebis Parabiaghi Duc.

"the location of Saint George, of the pieve of Parabiago, Duchy of Milan), while on maps of the Borromeo era (16th century) the town is mentioned as Cascina Sancti Georgi Plebis Parabiaghi Duc.

Over the centuries, thanks to the fertilization work of local farmers and the construction of artificial canals in the surrounding areas, the sangiorgese territory has been made arable.

[23] The first documented naming the sangiorgese community[24] is to an inscription carved on some bricks dated 1393 that were found during some excavations at the Church of Santissimo Crocifisso carried out in 1769, as evidenced by some notes in the San Giorgio su Legnano parish archive: [...] Questa Chiesa essendo stata atterrata nel rifabbricarne una nuova nel 1769 si ritrovarono nei fondamenti due grandi mattoni sui quali il Conte Giorgio Giulini scrittore ha letto la seguente iscrizione: "[...] MCCCLXXXXIII (1393) Die XXVI maii Fond.e prima Hae Ecclesia Hedificata per Comunem Istum Sotene ad Honorem dei Santi Georgii Quam Segrata Fuit per Dominum Archiepiscopun [...]" […]In English this archive text means: "this Church, having been landed in the refabrication of a new one in 1769, found two large bricks on the foundations on which Count Giorgio Giulini writer read the following inscription: 1393 – 26 May – is the first church built in this Sotena Commune in Glory of God and Saint George and was consecrated by the Reverend Archbishop".

A widespread folk etymology of the word Sotera, which ran among the inhabitants of the area, would like this term to be a reference to the allusion to the Roman necropolis ("underground": in the legnanese dialect sota tèra).

[26] The only tangible evidence of the medieval San Giorgio is a sixth-door window, with a terracotta edge, present in a building overlooking the main square, the so-called Casa della regina (en.

One of the chronicles of the famous battle (29 May 1176), the Annales of Cologne, contains information indicating where the Carroccio was probably, and therefore where plausibly the battle would be fought: so that no warrior could withdraw, the Lombardi "aut vincere aut mori parati, grandi fossa suum exercitum circumdederunt", i.e. "ready to win or die in the field, placed their army inside a large pit".

[29] This would suggest that the Carroccio was placed on the edge of a steep slope, so that the imperial cavalry, whose arrival was expected along the course of the Olona river, would be forced to storm the center of the army of the Lombard League going up the hollowing.

[29] Federico Barbarossa's army then came to the other side, from Borsano: this forced the municipal fanties to resist around the Carroccio, since they had the escape road barred by the Olona river, which they had behind them.

[33] In April 1273, Napoleone and Francesco della Torre welcomed king Edward I of England and Eleanor of Castile to Milan on their return from a trip to the Middle East.

[34] A popular legend, however, claims that the royals, on the way back, stayed overnight at San Giorgio su Legnano in the so-called "Queen's House".

[36] In the Middle Ages the community of Sotena, like the nearby Legnano, was on the border between the Seprio peasants (whose capital was Castelseprio) and Burgaria (probably under the hegemony of Parabiago), two counties dependent on the Lombardy Brand, which was a territorial division from the Longobards and Franks.

During this century the Spanish government auctioned off many land where the buyer, who had become a feudalist in this way, had the prerogative to boast political, economic and social rights to the fiefdom.

[42] Charles VI, Holy Roman Emperor, issued a decree establishing a working group, whose task was to accurately survey the municipalities belonging to his Lombard domains.

In the case of San Giorgio, the determination of the size of the territory began on 20 November 1721, thanks to a team of detectors and designers led by surveyor Benito Corradini.

[46] The process of industrialization that led to the gradual transformation of the sangiorgese economy was accelerated by two natural disasters that put local agriculture in crisis: cryptogamy, a disease that affected the vine, and nosematosis, an epidemic that damaged the cocoons of silkworms.

Following these epidemics, the wineries in San Giorgio su Legnano disappeared for good and the peasants concentrated their efforts on the production of cereals and the breeding of silkworms.

[50] To make the idea more precise of the economic system would be enough to mention the animals present in 1937 in the stables of sangiorgesi, compared to almost 3,900 inhabitants: 17 oxen, 31 calves, 126 cows, 46 horses, 3 donkeys, 1 mule, 1 hinny, 12 pigs and 11 goats.

[51] To complete the picture around the agricultural economy of the sangiorgese community, in the early 1940s, the cultivated fields provided about 1,800 tons of wheat, 400 rye and 80 oats.

Built in the mid-19th century, it is bound by the superintendence of environmental and architectural goods along with the manor house with their respective rustics as "natural beauty" (by ministerial decree of 25 June 1958).

In the 21st century it is not an important activity for the economy of San Giorgio su Legnano; it is carried out in a limited part of the municipality, south of the town, which is still free from construction and infrastructure.

This crisis, which led to the partial deindustrialization of San Giorgio su Legnano, continued in the following decades compromising the industrial fabric, employment and, more generally, the economic system of the municipality.

[64] In Legnanese dialect there are those who find traces of the languages of the peoples prior to the Latinization of the region, in particular the ancient Ligurian, although the data on the actual influence of this linguistic substrate are few and of varying interpretation.

[66] However, it was the Roman domination, which supplanted the Celtic one, that shaped the local idiom spoken in Legnanese, so much so that the lexicon and grammar of this dialect is of Romance derivation.

[68] In fact, in the first editions, the route of the race winded through the nearby roads of the agricultural area of the municipality: later it was moved to a public park, the Parco del Campaccio.

[69][70] San Giorgio su Legnano hosted the 2006 European Cross Country Championships, organized by the Unione Sportiva Sangiorgese on 10 December.