One of Leopold's younger sons was Bishop
Otto of Freising. His eldest son
Leopold IV became margrave in 1136, and in 1139 received the
Duchy of Bavaria from the hands of King
Conrad III, who had
banned the
Welf duke
Henry the Proud. Leopold's brother
Henry Jasomirgott (allegedly named after his favourite oath, "Yes, so [help] me God!") was made
Count Palatine of the Rhine in 1140, and became Margrave of Austria on Leopold's death in 1141. Having married Gertrude, the widow of Henry the Proud, he was invested in 1143 with the Duchy of Bavaria, and resigned his office as count palatine. In 1147 he participated in the
Second Crusade, and after his return, renounced Bavaria at the instance of the new king
Frederick Barbarossa who gave the duchy of Bavaria to Henry the Proud's son, Duke
Henry the Lion of Saxony. As compensation for this, Austria, the capital of which had been transferred to
Vienna about 1155, was elevated into a duchy according to the
Privilegium Minus.
Rise to power The second duke was Henry's son
Leopold V, who succeeded him in 1177 and took part in the crusades of 1182 and 1190 as well as the
Third Crusade. In Palestine, he quarrelled with King
Richard I of England, captured him on his homeward journey and handed him over to Emperor
Henry VI. Leopold increased the territories of the Babenbergs by acquiring the
Duchy of Styria under the will of his kinsman Duke
Ottokar IV. He died in 1194, and Austria fell to one son,
Frederick, and Styria to another,
Leopold; but on Frederick's death in 1198 they were again united by Leopold as Duke Leopold VI, surnamed "the Glorious". The new duke fought in the crusades in
Spain,
Egypt, and
Palestine, but is more celebrated as a lawgiver, a patron of letters, and a founder of many towns. Under him Vienna became the centre of culture in
Germany and the great school of
Minnesingers. His later years were spent in strife with his son Frederick, and he died in 1230 at San Germano, now renamed
Cassino, whither he had gone to arrange the peace between Emperor
Frederick II and
Pope Gregory IX.
Extinction Frederick II,
Leopold VI's son by
Theodora Angelina, succeeded his father as duke upon the elder man's death in 1230. Frederick II soon earned the epithet "the Quarrelsome" from his ongoing disputes with the kings of
Hungary and
Bohemia and with
Holy Roman Emperor Frederick II. Duke Frederick deprived his mother and sisters of their possessions, was hated by his subjects on account of his oppressive rule, and, in 1236, was placed under the imperial ban and driven from Austria. However, he was later restored to his duchy when Emperor Frederick II was excommunicated. Subsequently, Duke Frederick II treated with Emperor Frederick II in vain to make Austria a kingdom. The male line of the Babenbergs became extinct in 1246, when Frederick II was killed in battle (the
Henneberg branch of the Franconian Babenbergs lived on until 1583 when its lands were divided among the two branches of the
Wettin family). Frederick's heir general was
Gertrude of Austria, the only child of his late elder brother,
Henry of Austria by that man's wife,
Agnes of Thuringia. However, neither her husbands nor her son succeeded in settling the Babenberg inheritance under their power. Gertrude's only surviving child,
Agnes of Baden, tried to reclaim at least part of her inheritance through her third husband
Ulrich II of Heunburg, but was unsuccessful. After some years of struggle known as the
War of the Babenberg Succession (1246–1256/78/82), the Duchies of Austria and Styria fell to
Ottokar II of Bohemia, and subsequently to
Rudolph I of
Habsburg, whose descendants were to rule Austria until 1918. ==Genetic legacy==