 The push for this change was the reign of David I and the Davidian Revolution. Feudalism, government reorganisation and the first legally recognised towns (called burghs) began in this period. These institutions and the immigration of French and Anglo-French knights and churchmen facilitated cultural osmosis, whereby the culture and language of the low-lying and coastal parts of the kingdom's original territory in the east became, like the newly acquired south-east, English-speaking, while the rest of the country retained the Gaelic language, apart from the Northern Isles of Orkney and Shetland, which remained under Norse rule until 1468. The Scottish state entered a largely successful and stable period between the 12th and 14th centuries, there was relative peace with England, trade and educational links were well developed with the Continent and at the height of this cultural flowering John Duns Scotus was one of Europe's most important and influential philosophers.
