When Ottokar II married Gertrude's aunt, Margaret of Babenberg and moved into Austria, he had to flee, at first to Styria and later to the Sponheim court in Carinthia.

To legitimize his position, Ottokar married the late Duke Frederick II's sister Margaret, who was his senior by thirty years and the widow of Henry of Hohenstaufen ( who, ironically, had been engaged to Ottokar's aunt Saint Agnes of Bohemia prior to marrying Margaret ).

Ottokar ended his marriage to Margaret and married Béla's young granddaughter Kunigunda of Slavonia.

On 11 February 1252, Ottokar married Margaret, Duchess of Austria.

However, Margaret was much older than Ottokar.

Ottokar II ( 1253 – 78 ) married a German princess, Margaret of Babenberg, and became duke of Austria, thereby acquiring Upper and Lower Austria and part of Styria ; he conquered the rest of Styria, most of Carinthia, and parts of Carniola.

However, King Ottokar II of Bohemia, whose wife was Margaret, the sister of Duke Frederick II, also declared his claim to the two duchies.

* Margaret of Austria, Queen of Bohemia ( c. 1204 – 1266 ), titularly reigning Duchess of Austria & Styria, Queen consort of the Romans, Queen consort of Bohemia ; married Henry II of Sicily and Ottokar II of Bohemia

In the same year the Bohemian Přemyslids made a second attempt to confirm their claims to Austria by arranging the marriage between Gertrude's aunt Margaret of Babenberg and King Wenceslaus ' son Ottokar II, more than twenty years her junior.

Ottokar refused a wedding with the widow of his brother and decided to marry Margaret.

Ottokar acquired the imperial privileges sealed with a Golden Bull on the basis of the Privilegium Minus, which legitimazed his claim over the duchies of Austria and Styria, since Margaret was the heiress of the last duke by proximity of blood.

Pope Innocent IV, who had previously changed sides several times between Gertrude and Margaret, confirmed the lawful government of Margaret and Ottokar over both duchies on 6 May 1252.

Ottokar became King of Bohemia as Ottokar II and Margaret as his Queen consort.

Ottokar II kept Austria, Styria, Carinthia, and Carniola, claiming to be the heir designated by Margaret in their divorce settlement.

* King Ottokar II of Bohemia ( 1233 – 78 ), since 1252 husband of the ( childless ) Margaret of Babenberg, dowager Queen of the Romans and the only surviving sister of Duke Frederick.

However, Margaret was barren and they got divorced in 1260, Ottokar marrying a younger woman.

Margaret died in 1267 and left no children ( so her heiress would be Gertrude again )-but Ottokar kept Austria, Styria etc.

However, he had a mighty rival in King Ottokar II of Bohemia, who in 1252 married Frederick's sister Margaret to legitimize his claims.

In the meantime, her aunt and competitor for the duchies of Austria and Styria, Margaret, married Prince Ottokar of Bohemia, the second son and next heir of Wenceslaus I.

The aristocracy accepted Margaret and Ottokar as the rulers of Austria.

Ottokar was largely motivated since he sought to remarry into the Hungarian royal house ; he could not expect an heir with the significantly older and barren Margaret.

The Archbishop decided that the constant travels between Wroclaw and Salzburg were inappropriate for a child, and, in 1267, sent Henry to Prague to be raised at the court of King Ottokar II of Bohemia.

After the dynasty had become extinct with Frederick's death at the 1246 Battle of the Leitha River, they were adopted by his Přemyslid successor King Ottokar II of Bohemia.

Some of the fortresses built by Ottokar were for centuries the strongest in Bohemia.

Ottokar made him margrave of Moravia then, but the two never paid the demanded sum to the Holy Roman Emperor and so were deposed in June 1193 by a decision of the Diet of Worms, which appointed Bretislaus, Bishop of Prague, as duke.

Béla and his son commenced a military campaign against King Ottokar II's lands, but their troops were defeated on 12 July 1260 in the Battle of Kressenbrunn.

Being very fierce and capable warriors ( as noted by Istvan Vassary ), the king lead them in numerous expeditions against neighbouring countries ; most notably they played an important part in the battle of Rudolf of Habsburg and Ottokar II of Bohemia ( 1278 )-king Laszlo IV and the Cumans were on Rudolf's side.

All advances were destroyed, however, by Ottokar II, a Czech king, when he leveled the castle at Moson in 1271.

On 17 August 1186, he negotiated the Georgenberg Pact with Ottokar IV of Styria, by which Styria and the central part of Upper Austria were amalgamated into the Duchy of Austria after 1192.

The opponents were a Bohemian ( Czech ) army led by the Přemyslid king Ottokar II of Bohemia and the Imperial army under the German king Rudolph I of Habsburg in alliance with King Ladislaus IV of Hungary.

In 1269 Hlučín belonged to the lands that were split off Moravia by King Ottokar II of Bohemia as the Duchy of Opava, ruled by his illegitimate son Duke Nicholas I.

The margraves Adalbero and Ottokar II were his sons.

In the 10th and 11th century Bohemia proper, the March of Moravia and Kladsko were consolidated under the dukes of the ruling Přemyslid dynasty, whose scion Ottokar I gained the hereditary royal title in 1198 from the German ( anti -) king Philip of Swabia.

During the city's rebuilding, the left bank of the Psina was also settled, and in 1270, city rights were granted to the town by Ottokar II.

Wenceslaus had Ottokar proclaimed Duke of Austria and acclaimed by the nobility.

Ottokar II gained the support of the local nobility and was proclaimed Austrian and Styrian duke by the estates one year later.

* May 5 – Duke Ottokar IV of Styria ( b. 1163 )

* Ottokar II of Bohemia, later to become King of Bohemia, is elected Duke of Austria.

When Ottokar was placed under the Imperial ban, Duke Bolesław II the Bald of Legnica took the occasion, had his nephew Henry seized at Jelcz and imprisoned him in 1277.

Leopold increased the territories of the Babenbergs by acquiring Styria under the will of his kinsman Duke Ottokar IV.

* Nicholas I, Duke of Troppau, natural son of king Ottokar II of Bohemia, became Duke of Troppau in Silesia ( c. 1255 – 1318 )

Frederick was succeeded by Ulrich III, Duke of Carinthia, who married Agnes of Andechs a relative of the patriarch and endowed the churches and monasteries, established the government mint at the city of Kostanjevica, and finally ( 1268 ) willed to Ottokar II, King of Bohemia, all his possessions and the government of Carinthia and Carniola.

When the last Otakar Duke Ottokar IV of Styria died in 1192, the Styrian duchy was inherited by the Babenberg duke Leopold V of Austria according to the 1186 Georgenberg Pact.

In 1197 Ottokar forced his brother, Duke Vladislaus III Henry, to abandon Bohemia to him and to content himself with Moravia.

Ottokar entered Austria, where the estates acclaimed him as Duke.

Image: Jan-Goth-PremyslOtakar. jpg | Ottokar is accepted as Duke of Austria in 1251.

Though he made significant improvements to the castle, he defected to Ottokar II and Duke Albert of Austria.

In 1186 the Georgenberg Pact was signed, an inheritance contract between Ottokar IV, Duke of Styria, who lacked a male heir, and the Babenberg duke of Austria, Leopold V. Following the death of Ottokar IV in 1192, his duchy of Styria — then significantly bigger than the contemporary state, reaching from present day Slovenia to Upper Austria — fell to the House of Babenberg.

The first part was an agreement between Duke Ottokar IV of Styria ( from the Otakars dynasty ) and Duke Leopold V of Austria ( from the Babenberg dynasty ).

1290 – December 13, 1312 or 1313, probably at Pisa ) from the House of Habsburg was a son of Rudolf II, former Duke of Austria and Agnes, daughter of King Ottokar II Přemysl of Bohemia.

However in 1286 Meinhard II of Gorizia-Tyrol became Duke of Carinthia as recompensation for supporting King Rudolph against Ottokar and also retained Carniola and the Windic March as a fief.

Ottokar IV ( 1163 – May 8, 1192 ) was Margrave of Styria and Duke from 1180 onwards, when Styria, previously a margraviate subordinated to the duchy of Bavaria, was raised to the status of an independent duchy.