Eleanor of Austria also called Eleanor of Castile, was born an Archduchess

Archduke

The title of Archduke denotes a noble rank above Duke and below King, used only by princes of the Houses of Habsburg and Habsburg-Lorraine....

 of Austria

Austria

Austria , officially the Republic of Austria , is a landlocked country of roughly 8.4 million people in Central Europe. It is bordered by the Czech Republic and Germany to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the...

 and Infanta of Castile from the House of Habsburg

Habsburg

The House of Habsburg , also found as Hapsburg, and also known as House of Austria is one of the most important royal houses of Europe and is best known for being an origin of all of the formally elected Holy Roman Emperors between 1438 and 1740, as well as rulers of the Austrian Empire and...

, and subsequently became Queen consort

Queen consort

A queen consort is the wife of a reigning king. A queen consort usually shares her husband's rank and holds the feminine equivalent of the king's monarchical titles. Historically, queens consort do not share the king regnant's political and military powers. Most queens in history were queens consort...

 of Portugal

Portugal

Portugal , officially the Portuguese Republic is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the...

 (1518–1521) and of France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 (1530–1547). She also held the Duchy of Touraine

Touraine

The Touraine is one of the traditional provinces of France. Its capital was Tours. During the political reorganization of French territory in 1790, the Touraine was divided between the departments of Indre-et-Loire, :Loir-et-Cher and Indre.-Geography:...

 (1547–1558) as dower

Dower

Dower or morning gift was a provision accorded by law to a wife for her support in the event that she should survive her husband...

. She is called "Leonor" in Spanish and Portuguese and "Eléonore" or "Aliénor" in French.
Eleanor was born in Louvain

Leuven

Leuven is the capital of the province of Flemish Brabant in the Flemish Region, Belgium...

 as the eldest child of Philip of Austria

Philip I of Castile

Philip I , known as Philip the Handsome or the Fair, was the first Habsburg King of Castile...

 and Joanna of Castile

Joanna of Castile

Joanna , nicknamed Joanna the Mad , was the first queen regnant to reign over both the Crown of Castile and the Crown of Aragon , a union which evolved into modern Spain...

, who would later become co-sovereigns of Castile.