Margraviate of Austria in the context of "Ostmark (Austria)"

The Archduchy of Austria (Latin: Archiducatus Austriae; German: Erzherzogtum Österreich) was a major principality of the Holy Roman Empire and the nucleus of the Habsburg monarchy. With its capital at Vienna, the archduchy was centered at the Empire's southeastern periphery.

Its present name originates from the Frankish term Oustrich – Eastern Kingdom (east of the Frankish kingdom). The archduchy developed out of the Bavarian Margraviate of Austria, elevated to the Duchy of Austria according to the 1156 Privilegium Minus by Emperor Frederick Barbarossa. The House of Habsburg came to the Austrian throne in Vienna in 1282 and in 1453 Emperor Frederick III, also the ruler of Austria, officially adopted the archducal title. From the 15th century onward, all Holy Roman Emperors but one were Austrian archdukes and with the acquisition of the Bohemian and Hungarian crown lands in 1526, the Habsburg hereditary lands became the centre of a major European power.

The Duchy of Austria (Latin: Austriae Ducatus; Middle High German: Herzogtum Österreich) was a medieval principality of the Holy Roman Empire, established in 1156 by the Privilegium Minus, when the Margraviate of Austria (Ostarrîchi) was detached from Bavaria and elevated to a duchy in its own right. After the ruling dukes of the House of Babenberg became extinct in male line, there was as much as three decades of rivalry on inheritance and rulership, until the German king Rudolf I took over the dominion as the first monarch of the Habsburg dynasty in 1276. Thereafter, Austria became the patrimony and ancestral homeland of the dynasty and the nucleus of the Habsburg monarchy. In 1453, the archducal title of the Austrian rulers, invented by Duke Rudolf IV in the forged Privilegium Maius of 1359, was officially acknowledged by the Habsburg emperor Frederick III.

The history of Austria covers the history of Austria and its predecessor states. In the late Iron Age Austria was occupied by people of the Hallstatt Celtic culture (c. 800 BC), they first organized as a Celtic kingdom referred to by the Romans as Noricum, dating from c. 800 to 400 BC. At the end of the 1st century BC, the lands south of the Danube became part of the Roman Empire. In the Migration Period, the 6th century, the Bavarii, a Germanic people, occupied these lands until it fell to the Frankish Empire established by the Germanic Franks in the 9th century. In the year 976 AD, the first state of Austria formed. The name Ostarrîchi (Austria) has been in use since 996 AD when it was a margravate of the Duchy of Bavaria and from 1156 an independent duchy (later archduchy) of the Holy Roman Empire (962–1806).

Austria was dominated by the House of Habsburg and House of Habsburg-Lorraine from 1273 to 1918. In 1806, when Emperor Francis II of Austria dissolved the Holy Roman Empire, Austria became the Austrian Empire, and was also part of the German Confederation until the Austro-Prussian War of 1866. In 1867, Austria formed a dual monarchy with Hungary: the Austro-Hungarian Empire. When this empire collapsed after the end of World War I in 1918, Austria was reduced to the main, mostly German-speaking areas of the empire (its current frontiers), and adopted the name, the Republic of German-Austria. However, union with Germany and the chosen country name were forbidden by the Allies at the Treaty of Versailles. This led to the creation of the First Austrian Republic (1919–1933).

The House of Babenberg was a noble dynasty of Austrian Dukes and Margraves. Descending from the Popponids and originally from Bamberg in the Duchy of Franconia (present-day Bavaria), the Babenbergs ruled the imperial Margraviate of Austria from its creation in 976 AD until its elevation to a duchy in 1156, and from then until the extinction of the line in 1246, whereafter they were succeeded by the House of Habsburg.

From 976 until 1246, the Margraviate of Austria and its successor, the Duchy of Austria, was ruled by the House of Babenberg. At that time, those states were part of the Holy Roman Empire. From 1246 until 1918, the duchy and its successor, the Archduchy of Austria, was ruled by the House of Habsburg. Following the defeat and dissolution of Austria-Hungary in World War I, the titles were abolished or fell into abeyance with the establishment of the modern Republic of Austria.

The native (German) name of Austria, Österreich, derives from the Old High German word Ostarrîchi "eastern realm", recorded in the so-called Ostarrîchi Document of 996, applied to the Margraviate of Austria, a march, or borderland, of the Duchy of Bavaria created in 976. The name is seemingly comparable to Austrasia, the early middle age term for the "eastern lands" of Francia, as known from the written records.

The Old High German name parallels the Middle Latin name Marchia Orientalis ("eastern borderland"), alternatively called Marchia austriaca. The shorter Latinized name Austria is first recorded in the 12th century. It has occasionally led to confusion, because, while it renders the Germanic word for "east" it is reminiscent of the native Latin term for "south", auster (see Name of Australia).