Orderic Vitalis names “filium...Henricum duasque filias Clariciam et Hodiernam” as the children of David King of Scotland and his wife. Robert of Torigny names "filium Henricum duasque filias Clariciam et Hodiernam" as children of "David [rex Scotiæ] frater [Alexandri]" & his wife. "Matilde comitisse, Henrico filio comitis…" witnessed the charter dated to  under which "David comes filius Malcolmi Regis Scottorum" founded the abbey of Selkirk. "David comes filii Malcolmi regis Scotorum" founded the monastery of Kelso by charter dated to [1119/24] witnessed by "Matilda comitissa, Henrico filio comitis…Willo nepote comitis…".
He succeeded as Earl of Huntingdon in [Feb 1136], on his father's resignation of the earldom. He was created Earl of Northumberland in 1139 by King Stephen as part of the peace settlement which followed the battle of the Standard. He remained at the court of King Stephen for some time.
Robert of Torigny records that "Henricus filius eius" died the year before "David rex Scotiæ". 1
EARLDOM OF NORTHUMBERLAND (I) 1139
EARLDOM OF HUNTINGDON (IV) 1136
HENRY OF SCOTLAND, younger son, was born about 1114, and succeeded as EARL OF HUNTINGDON on his father's resignation of the Earldom in 1136. During the wars between his father and Stephen he fought on the Scottish side at the Battle of the Standard. On peace being made in 1139 he received the Earldom of Northumberland, the cities of Newcastle and Bamborough being excepted. He became a favourite with Stephen, remaining with him in England for some time. As "Henry the Earl, son of the King of Scotland," he made grants to St. Andrew's, Northants, and in 1150 founded the Abbey of Holmcultram in Cumberland.
He married Ada (or Adeline), daughter of William (de WARENNE), EARL OF SURREY, by Isabel, daughter of Hugh, COUNT OF VERMANDOIS. He died v.p., 12 June 1152, and was buried at Kelso [k]. His widow died in 1178, having in that year founded the Nunnery of Haddington. 2
[k] He is described as handsome in body and virtuous of life, beloved by all, devout towards God and most compassionate to the poor; and St. Bernard says he was a brave and wise knight, following bis father in the pursuit of justice and the love of man.
Henry, son of the said David, King of Scotland, on condition of swearing allegiance to Stephen, had the Earldom and honour of Huntingdon, with the borough of Doncaster and Carlisle as an augmentation thereto. He was in such high estimation with King Stephen that, upon that monarch's solemn celebration of the feast of Easter, he placed the Earl of Huntingdon on his right hand, which gave such displeasure to the nobility then present that William Corbois, or Corbel, Archbishop of Canterbury, Ranulph, Earl of Chester, and several others withdrew from court. He m. Ada, sister of William, Earl of Warrenne and Surrey, and had issue, Malcolm and William, successively Kings of Scotland, David, Ada, m. to Floris, Earl of Holland, and Margaret, m. to Conan le Petit, Earl of Brittany. The earl d. in 1153, a little before his father, and, upon his decease, Simon de St. Liz, Earl of Northampton, was restored to the Earldom of Huntingdon. 3