King David I was brought up in the court of King Henry I of England. He had many Norman and Flemish friends and on his succession to the the throne ceded some lands over to them. The feudal system introduced involved the Mormaers - the most powerful clan chieftains - being titled Earls, and law and order now maintained by (mainly Norman) barons or sheriffs each given a barony to administer by royal consent.
This was planned to ensure the barons would provide a counterbalance to the powerful Earls. Each earldom contained many barons who could subdue an Earls influence. To stop the barons becoming too powerful their estates were small. Thus Drumchapel later became part of the estates of Drumry and Garscadden.
King David I accelerated the process of introducing the Roman Catholic church into Scotland, displacing the Celtic church. During his reign there was established many abbeys:- among them, Dunfermline, Kelso, Melrose, Holyrood, Dryburgh and Paisley Abbey. The nobles would later patronise local churches- as with St. Mary's Chapel, Drumry. Under threat of excommunication, David and his bishops rejected the plans of Pope Innocent III to make the Scottish church subserviant to the Archbishop of York. He also introduced the orders of the Knights Templar and Knights Hospitaller in Scotland.
David I created many Royal Burghs and increased trade. The Flemings, famed for their skill in town planning, played a large part in this process. When David died in 1153, King Stephen of England had already ceded Northumbria to Scotland - and Scotland stretched further southwards than ever before or since.