David I or Dauíd mac Maíl Choluim (Modern: Daibhidh I mac [Mhaoil] Chaluim;c. 1084 – 24 May 1153) was a 12th-century ruler who was Prince of the Cumbrians (1113–1124) and later King of the Scots (1124–1153). The youngest son of Máel Coluim III (Malcolm III) and Margaret of Wessex, David spent most of his childhood in Scotland, but was exiled to England temporarily in 1093. Perhaps after 1100, he became a dependent at the court of King Henry I. There he was influenced by the Norman and Anglo-French culture of the court.

When David's brother Alexander I of Scotland died in 1124, David chose, with the backing of Henry I, to take the Kingdom of Scotland (Alba) for himself. He was forced to engage in warfare against his rival and nephew, Máel Coluim mac Alaxandair. Subduing the latter seems to have taken David ten years, a struggle that involved the destruction of Óengus, Mormaer of Moray. David's victory allowed expansion of control over more distant regions theoretically part of his Kingdom. After the death of his former patron Henry I, David supported the claims of Henry's daughter and his own niece, the former Empress-consort, Matilda, to the throne of England. In the process, he came into conflict with King Stephen and was able to expand his power in northern England, despite his defeat at the Battle of the Standard in 1138.

...
Wikipedia