After his marriage in 1766 with Caroline Matilda (1751-1 775), daughter of Frederick, prince of Wales, he abandoned himself to the worst excesses.
His daughters were: Matilda (1156-1189), who became the wife of Henry the Lion, duke of Saxony; Eleanor (1162-1214), who married Alphonso III., king of Castile; and Joanna, who, after the death of William of Sicily in 1189, became the wife of Raymund VI., count of Toulouse, having previously accompanied her brother, Richard, to Palestine.
But the marriage proved childless, and the empress Matilda was designated as her father's successor, the English baronage being compelled to do her homage both in 1126, and again, after the Angevin marriage, in 1131.
His widow, Beatrice, in 1055 married Godfrey, duke of Lorraine, and governed the country till her death in 1076, when she was succeeded by Matilda (q.v.), her only child by her first husband.
In 1141 he joined Matilda in London and accompanied her to Winchester, but after a narrow escape from capture he returned to Scotland.
While merely a prior of Bec he led the opposition to the uncanonical marriage of Duke William with Matilda of Flanders (1053) and carried matters so far that he incurred a sentence of exile.
Though entered as a student at Trinity College, Dublin, Tone gave little attention to study, his inclination being for a military career; but after eloping with Matilda Witherington, a girl of sixteen, he took his degree in 1786, and read law in London at the Middle Temple and afterwards in Dublin, being called to the Irish bar in 1789.
The chief triumphs of his foreign policy were the marriage of his daughter Matilda to the emperor Henry V.
This union took place in defiance of a prohibition which had been promulgated, in 1049, by the papal council of Reims. But the affinity of William and Matilda was so remote that political rather than moral considerations may have determined the pope's action.
In 1127, in the character of an English baron, he swore fealty to Matilda as heiress to her father Henry I., and when the usurper Stephen ousted her in 1135 David vindicated her cause in arms and invaded England.