Ottokar IV was Margrave

Margrave

A margrave or margravine was a medieval hereditary nobleman with military responsibilities in a border province of a kingdom. Border provinces usually had more exposure to military incursions from the outside, compared to interior provinces, and thus a margrave usually had larger and more active...

 of Styria and Duke

Duke

A duke or duchess is a member of the nobility, historically of highest rank below the monarch, and historically controlling a duchy...

 from 1180 onwards, when Styria, previously a margraviate subordinated to the duchy of Bavaria

Duchy of Bavaria

The Duchy of Bavaria was the only one of the stem duchies from the earliest days of East Francia and the Kingdom of Germany to preserve both its name and most of its territorial extent....

, was raised to the status of an independent duchy. He was the son of Ottokar III of Styria

Ottokar III of Styria

Ottokar III was Margrave of Styria from 1129 until 1164. He was the son of Leopold the Strong and father of Ottokar IV, the last of the dynasty of the Otakars. His wife was Kunigunde of Chamb-Vohburg....

 and the last of the dynasty of the Ottakars

Otakars

The Otakars were a mediæval dynasty ruling the March of Styria from 1056 to 1192.The dynasty began with Otakar I, probably a son-in-law of Aribo , margrave of Pannonia. Otakar was Count of Steyr in the Traungau, in what is today Upper Austria. Together with Margrave Luitpold, he may have been...

. He entered into the Georgenberg Pact

Georgenberg Pact

The Georgenberg Pact was signed on 17 August 1186 on the Georgenberg mountain above Enns and consisted of two parts. The first part was an agreement between Duke Ottokar IV of Styria and Duke Leopold V of Austria...

 with Leopold V of Austria in 1186, which brought Styria under joint rule with Austria after his death in 1192. The childless and deathly ill Ottokar, who had contracted leprosy

Leprosy

Leprosy or Hansen's disease is a chronic disease caused by the bacteria Mycobacterium leprae and Mycobacterium lepromatosis. Named after physician Gerhard Armauer Hansen, leprosy is primarily a granulomatous disease of the peripheral nerves and mucosa of the upper respiratory tract; skin lesions...

 while on crusade, was to give his duchy to Leopold and to his son Frederick

Frederick I, Duke of Austria (Babenberg)

Frederick I of Austria was a Duke of Austria from the Babenberg family. He was a son of Duke Leopold V and, in 1197, participated in the Emperor Henry VI's Crusade of 1197.He died on the return from Palestine....

 under the stipulation that Austria and Styria would henceforth remain undivided.
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Ottokar III

Ottokar III of Styria

Ottokar III was Margrave of Styria from 1129 until 1164. He was the son of Leopold the Strong and father of Ottokar IV, the last of the dynasty of the Otakars. His wife was Kunigunde of Chamb-Vohburg....

| width="40%" align="center" | Margrave of Styria

March of Styria

The March of Styria was originally broken off the Duchy of Carinthia before 970 as a buffer zone against the Magyars. Originally it was known as the Carantanian march , after the former Slavic principality of Carantania, a predecessor of the Carinthian duchy...

, later Duke of Styria
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Leopold V of Austria