David, EARL OF HUNTINGDON &C., by Maud, 1st sister and coheir of Ranulph (DE BLUNDEVILLE), EARL OF CHESTER. [Complete Peerage]
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on the history of the Earldom of Huntingdon:
After Earl Simon's [Matilda's 1st husband] death, his Widow married David I of Scotland, who consequently became Earl of Huntingdon too, keeping the Earldom even after he succeeded his brother as King of Scots. He sided with the Empress Maud against Stephen I but came to terms with the latter and made the Earldom over to his son Henry. Henry swore fealty to Stephen but subsequently fought against him under the Scottish banner, which may account for Simon de St Liz's son, another Simon, being recognized as Earl of Huntingdon before Henry's death in 1152. Thereafter the Earldom was more or less bounced back and forth between the de St Liz family and the Kings of Scotland, first being held 1157-65 by Malcolm the Maiden and (1165-74) by his brother William The Lion, King of Scots, then by a Simon de St Liz (grandson of the first Simon and son of the second) from 1174 to 1184.
When the third Simon de St Liz died in 1184 he left no surviving issue and David, younger brother of the Kings of Scots just mentioned, assumed the Earldom from 1185 (on the handing over of it to him by William the Lion) till it was taken away from him in 1215 or 1216 by King John. He got it back again in 1218, however. [Burke's Peerage]
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David, Earl of Huntingdon, accompanied King Richard I to the Holy Land with 500 men in his train; but upon his return, his fleet being shattered, his lordship was made prisoner by the Egyptians and eventually redeemed by the Venetians. He m. Maud, dau. of Hugh Kyvelioc, and sister and co-heir of Ralph, Earl of Chester, and had surviving issue, John surnamed Le Scot, Margaret, Isabel, Ada, Maud. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, London, 1883]