Lozoyuela tradition that was founded by two neighbors Lozoya separated from their primitive village by dissension contributory. The first settlement should be located 2 k. NO. in what is known as Source Blanquilla. The first settlement should occur at the time of the Reconquista, when the kings, fostered the process of resettlement and settlement). During the Muslim occupation, these territories were part of the Marca Media or no man"s land that separated the Christian and Islamic territories.

Since its founding, the history of Lozoyuela first is linked to the Community of the Land and Villa Buitrago (reconquers, reforestation and feudalización in the eleventh century by Alfonso VI) and then called the Lordship of Buitrago, linked to the home of Dukes of Infantado (XII century), in particular Lozoyuela, Navas de Buitrago and Sieteiglesias quarter belonged to the throat.

The first written documents that are in our municipality are related to the literature, this is the "Serranilla" composed by the Marquis of Santillana (XV century). Subsequently, we find references in the registry and cadastre of the sixteenth century. Lozoyuela by this time had two populations: Lozoyuela and the hamlet of Relaño at the far north near the town of Arroyo de la Alameda Nava.

Between the sixteenth and eighteenth centuries was a steady growth of population in Lozoyuela (not in Las Navas and Sieteiglesias who were much poorer). Although the traditional Lozoyuela are livestock and agriculture, in this age begin to flower craft workshops to take to other towns of the region. Built three mills, two in Lozoyuela and one in Sieteiglesias. Lozoyuela, this time with all the millers, weavers, tailors, blacksmiths, bakers, Mesonero, bartenders, surgeon, teacher of children and heals itself.
Moreover, its mountains and meadows, especially Canalejas, are very much appreciated by the farmers of the place for outsiders, becoming area required for grazing cattle and Cañada Real Mesta.
During the first quarter of the nineteenth century the population nearly doubles Lozoyuela. Is still based on agriculture and livestock industry with a reduced number of textile workshops. However, his privileged position to be in the way of real Burgos, showed establishments and increase services for travelers: a house with horses posts refresh, stop out, three lodges and two inns. During the first half of the twentieth century was a gradual depopulation of the towns of Las Navas Sieteiglesias and leading to the merger of the three cores in a single municipality in 1973. There are currently surveyed Lozoyuela in the nucleus of a population of 902 inhabitants. The municipality has a total of 1124 inhabitants.

The history of Las Navas back like that of Sieteiglesias and Lozoyuela to the eleventh century, the result of restocking that took place after the Reconquest in mostly shepherds from Segovia. Thus were born Las Navas de Buitrago, whose name comes from its first settlers, pastoralists who settled in praderías who attended with their flocks.

It was part of the Lordship of Buitrago but their isolation made it one of the most humble of the area, indeed in 1560 was to sell part of the meadow councilman to pay for the enclosure of pastureland boyal. Throughout the seventeenth century the whole region will experience a decline in population of sixty people who were in the mid-sixteenth century, in 1670 are only twelve, in spite of that throughout the eighteenth century the population will increase dramatically , to take the year 1778 two hundred and forty-six people. Throughout the nineteenth century socio-economic structure underwent a transformation, La Mesta disappeared and Noble, began the process of land desamortizador and provincial demarcation of 1833 placed the region in Madrid, breaking its union with historic Guadalajara.

The economy of Las Navas was still based on sheep farming, the population continued to grow, reaching the end of the century two hundred inhabitants. At this time there were forty-six houses distributed in eight streets and two squares of a voyage. The square of the Church and the Constitution of the street were joined by the Church, the most important. There was a building for the municipality and another for the Elementary School. Since the early twentieth century Las Navas was experiencing a gradual decline in population and activity. In 1973 and annexed to Sieteiglesias LOZOYUELA form the municipality. Surveyed are currently at the heart of Las Navas, a population of 65 habitants.

The population of Sieteiglesias, bordering the municipalities of Mangirón north Lozoyuela west and south and the stream Berrueco The Jóbalo. Crosses through the center of town, the district M-131 and is 865 meters above sea level. It is an area of meadows and pastures, with patches of trees and be rrocales. The oldest archaeological finds found in the district belong to the necropolis, dated at about IX to XI centuries.

The village is situated on Sieteiglesias an offshoot of the Roman road north of route 25 of Antoninus, the way that starting from Toletum Titulcium joined up with Complutum to Valdetorres del Jarama, continuing north, the port looking for Somosierra Buitrago de Lozoya. The Roman road linking the valley of Jarama with Sepulveda through the mountains to land more flat and accessible, the way to go to The Torrelaguna Berrueco, on the east side of the hill of the move Cabrera to the stream by the bridge Jóbalo Roman Sieteiglesias, across the population, according to Mangirón and there Buitrago.

In time this area is Arabic for several centuries in the area of "frontier". Its population was predominantly of animal husbandry. The only sign of power Andalusí on this territory is in the construction of a line of defensive towers, built in the century X. The closest would be in the Berrueco. In medieval times this road will become an important livestock.

From the eleventh century Sieteiglesias be united into the "Land of Buitrago," which is mentioned first in the year 1076, in the Place de Sepúlveda, granted by Alfonso VI to repopulate the border areas, in this time should correspond to restock Sieteiglesias. Throughout the next two centuries the population is organized on a feudal system based on the councils, the first around and then Sepúlveda Buitrago. In this era will be joining the economy of rainfed agriculture, although the element of greatest economic importance will be the livestock.

In 1273 with the formation of the Council of the Mesta Honrado expanded and improved routes of livestock. Two strings of Cañada Real Segovia run through Sieteiglesias, a parallel to the Cañada, linking the bridge at the edge of Jóbalo The Berrueco with Sieteiglesias and the second to cross the river Lozoya Cañada crossing and goes to Berzosa of Cabanillas Sierra across the Borough of Sieteiglesias. During the fourteenth century Lands Buitrago were composed by villas Buitrago, the Hiruela the Atazar and Puebla, six more districts or quarters. The fourth quarter includes the locations of throat, Cuadrón, Pajarillo, La Cabrera, Lozoyuela, Relaño, Mangirón, Las Navas and Sieteiglesias. These people belonged to the Lordship of Buitrago, to respond to the breasts and mayorazgo rights to their lands and rents belonging to the Party and administrative and judicial Buitrago.

From the sixteenth century the population of Sieteiglesias experience great growth that will extend throughout the seventeenth century, joining the expansion of the town. However, we move through the eighteenth century the people"s economy will decline, had a population of 19 residents but increase slightly during the nineteenth century to decay along the XX to less than forty neighbors, in 1973, when union with the municipality Lozoyuela. There are currently surveyed Lozoyuela in the nucleus of a population of 157 inhabitants.