David upheld his support for his niece, the former Empress-consort, who had how many children?
Empress Matilda Empress Matilda (c. 7 February 110210 September 1167), also known as the Empress Maude, was the claimant to the English throne during the civil war known as the Anarchy. The daughter of King Henry I of England, she moved to Germany as a child when she married the future Holy Roman Emperor Henry V. She travelled with her husband into Italy in 1116, was controversially crowned in St. Peter's Basilica, and acted as the imperial regent in Italy. Matilda and Henry had no children, and when Henry died in 1125, the crown was claimed by Lothair II, one of his political enemies.
Helena of Hungary, Duchess of Austria Helena (Ilona) of Hungary (  1155 – 25 December 1199), a member of the royal Árpád dynasty, was Duchess of Austria from 1177 and Styria from 1192 to 1194 by her marriage with the Babenberg duke Leopold V of Austria.