On this day in 1124, upon the death of his brother Alexander I, David (Dabíd mac Maíl Choluim) made himself king of Scotland with the full backing of Henry I of England. He had been Prince of the Cumbrians (1113-1124) before becoming King of Scotland (1124-1153). Cumbria was in effect a separate kingdom to that of Scotland (known as Alba) to the north and became merged with it upon the ascension of David to King of Scotland.
His reign was one of warfare and expansion, with the first 10 years of his reign involving a struggle for power with his nephew (the son of Alexander I) Máel Coluim mac Alaxandair. With the death of Henry I of England, he came into conflict with King Stephen and expanding the Scottish Kingdom into northern England.
David I is seen as a ‘reformer’ in the Scottish Church, setting out to reorganise the church. The map in this post shows the boundaries of the various dioceses he put in place. He is also seen as a reformer of Scotland as a whole, bringing civility to a barbaric country.