Constance of Babenberg was the daughter of Duke Leopold VI of Austria

Leopold VI, Duke of Austria

Leopold VI , called the Glorious, from the House of Babenberg, was Duke of Austria from 1198 to 1230 and of Styria from 1194 to 1230....

 and his wife, Theodora Angelina

Theodora Angelina (wife of Leopold VI of Austria)

Theodora Angelina was the wife of Leopold VI of Austria, by whom she had several children.-Birth and parentage and early life:...

She married on 1 May 1234 with Margrave Henry "the Illustrious"

Henry III, Margrave of Meissen

Henry III, called Henry the Illustrious from the House of Wettin was Margrave of Meissen and last Margrave of Lusatia from 1221 until his death; from 1242 also Landgrave of Thuringia.-Life:Born probably at the Albrechtsburg residence in Meissen, Henry was the youngest son of Margrave Theodoric I...

 of Meissen. The wedding took place in Vienna rather than in the old Hofburg. It is believed that the conversion of the Imperial Palace had not completed, or perhaps it was too small. There are three sources for information about the wedding itself. Two of them report that the wedding happened , in other words, in Stadlau. The third source reports happened in , a name which has fallen into disuse and was used instead of today's Floridsdorf

Floridsdorf

Floridsdorf is the 21st district of Vienna, Austria .Floridsdorf is located in the northern part of Vienna.The District Office and the centre of Floridsdorf are located round Am Spitz, at the junction of Prager Straße and Brünner Straße .Since 2004, Floridsdorf has had its own tower: the...

. The two sources, reporting Stadlau, also published a list of wedding guests. Present were the kings of Hungary

Hungary

Hungary , officially the Republic of Hungary , is a landlocked country in Central Europe. It is situated in the Carpathian Basin and is bordered by Slovakia to the north, Ukraine and Romania to the east, Serbia and Croatia to the south, Slovenia to the southwest and Austria to the west. The...

 and Bohemia

Bohemia

Bohemia is a historical region in central Europe, occupying the western two-thirds of the traditional Czech Lands. It is located in the contemporary Czech Republic with its capital in Prague...

, the Archbishop of Salzburg

Archbishopric of Salzburg

The Archbishopric of Salzburg was an ecclesiastical State of the Holy Roman Empire, its territory roughly congruent with the present-day Austrian state of Salzburg....

, the bishops of Passau, Bamberg, Freising

Roman Catholic Archdiocese of Munich and Freising

The Archdiocese of Munich and Freising is an ecclesiastical territory or diocese of the Roman Catholic Church in Bavaria, Germany. It is led by the prelature of the Archbishop of Munich, who administers the see from the mother church in Munich, the Frauenkirche, also known as Munich Cathedral...

 and Seckau

Roman Catholic Diocese of Graz-Seckau

The Roman Catholic Diocese of Graz-Seckau is a diocese comprising the Austrian state of Styria and is part of the Ecclesiastical province of Salzburg.-History:...

. From the secular aristocracy also Margrave of Moravia

Moravia

Moravia is a historical region in Central Europe in the east of the Czech Republic, and one of the former Czech lands, together with Bohemia and Silesia. It takes its name from the Morava River which rises in the northwest of the region...

, Saxony

Saxony

The Free State of Saxony is a landlocked state of Germany, contingent with Brandenburg, Saxony Anhalt, Thuringia, Bavaria, the Czech Republic and Poland. It is the tenth-largest German state in area, with of Germany's sixteen states....

 and the dukes of Carinthia

Duchy of Carinthia

The Duchy of Carinthia was a duchy located in southern Austria and parts of northern Slovenia. It was separated from the Duchy of Bavaria in 976, then the first newly created Imperial State beside the original German stem duchies....

 and the Landgrave of Thuringia

Thuringia

The Free State of Thuringia is a state of Germany, located in the central part of the country.It has an area of and 2.29 million inhabitants, making it the sixth smallest by area and the fifth smallest by population of Germany's sixteen states....

 were present. The guest list this suggests the importance of the Duke of Babenberg.

Henry and Constance had two sons: Albert II, the Degenerate

Albert II, Margrave of Meissen

Albert II, the Degenerate was a Margrave of Meissen, Landgrave of Thuringia and Count Palatine of Saxony...

 and Dietrich of Landsberg.

In 1910, a street in Donaustadt

Donaustadt

Donaustadt is the 22nd district of Vienna, Austria .Donaustadt is the eastern fourth of Vienna.- Geography :The Donaustadt district is in the northeast part of Vienna and is the largest of the districts in area, occupying about one-quarter of the Vienna city area, 102.24 km².It borders the...

 (the 22nd district of Vienna

Vienna

Vienna is the capital and largest city of the Republic of Austria and one of the nine states of Austria. Vienna is Austria's primary city, with a population of about 1.723 million , and is by far the largest city in Austria, as well as its cultural, economic, and political centre...

), was named after her: .