The rapid advance of Afonso Henriques from Coimbra to Lisbon created a vast, relatively uninhabited tract of land between north and south. The repopulation of this deserted territory with Christian settlers began immediately. Afonso Henriques invited many of the crusaders to remain after the siege of Lisbon and granted them lands, especially at Atouguia and Lourinhã, as payment for their help. In addition, Sancho I directed most of his time and energy to settling the new monarchy, for which he is known as The Populator (O Povoador). He sent agents abroad, especially to Burgundy, the land of his ancestors, to recruit colonists, who settled at various places, but especially at Vila dos Francos (present-day Azambuja). Such communities spread rapidly throughout the realm thanks to the protection of the king, who saw in them not only a way to populate the kingdom but also a way to diminish the power of the nobility.

The vacant territory between north and south was also filled by various monastic orders, including the Franciscans, Dominicans, and Benedictines. The Roman Catholic Church granted charters to the orders to build monasteries and cultivate the surrounding land. The most successful of these orders were the Benedictines, who built a monastery at Alcobaça and planted the surrounding land in orchards that remain to this day. This monastery grew to over 5,000 monks and occupied a huge territory stretching from Leiria in the north to Óbidos in the south, including the port-town of Pederneira (present-day Nazaré).

In the valley of the Tagus and to the south, settling communities of unarmed colonists was too dangerous therefore, early Portuguese kings called upon religious-military orders to fortify, cultivate, and defend this territory. Founded in the early twelfth century to wage war against infidels and protect pilgrims, these religious orders of knights had become powerful in the Holy Land and in many areas of Europe. Several orders of knight-monks were given huge tracts of land in the Tagus Valley and the Alentejo as recompense for their military service to the king at a time when he had no standing army on which to rely. The most successful of these knight-monks was the Order of the Templars, which was granted territory on the Zêzere River (Rio Zêzere), a tributary of the Tagus, where they built a fortified monastery in Templar fashion at Tomar. The Templar domain gradually grew to encompass territory from Tomar in the north to Santarém in the south and as far west as the lands of the Benedictines at Alcobaça. As more territory in the Alentejo was reconquered, additional orders were granted tracts of land to defend and cultivate. The Order of the Hospitallers was given land surrounding Crato the Order of the Calatravans (later Avis) was established at Évora and the Order of the Knights of Saint James was given lands at Palmela.

Data as of January 1993