She was also Countess of Lingen and of Leerdam, and Lady of IJsselstein, of Borssele, of Grave, of Cranendonck, of Jaarsveld, of Kortgene, of Sint Maartensdijk, and of Odijk.

Maximiliaan's main activities were those of Charles V's army commander, first in an argument with Guelders, later in a campaign in the German areas against the Schmalkaldic League .

He also played a role as a director, both as captain general and stadholder of Friesland, Groningen and Overijssel, and in his extensive possessions around Buren and in Zeeland.

[2] Given his high position, father Maximiliaan was on good terms with Charles V (1500-1558), then emperor of the Holy Roman Empire, king of Spain and landlord of the Habsburg Netherlands and his sister, Mary of Hungary (1505-1558), governor of the Habsburg Netherlands.

Whether and how she was prepared for the administration of the vast estates and wonderful rights belonging to the County of Buren is unknown.

Her father died quite unexpectedly at the court in Brussels in 1548, reportedly dressed in full armor and surrounded by his confidants, but in the absence of his wife and daughter.

On his deathbed, Maximiliaan arranged the marriage of William of Nassau, Prince of Orange, one of the most prominent young noblemen of the time and of the same age as his daughter.

However, as countess van Buren and especially as princess of Orange, she must have played a leading role alongside her husband in the world of the high nobility of the Dutch regions.

At the beginning of 1558 Anna was supposed to go to Dillenburg with William, but because of her illness the trip was canceled.

A version of the same portrait, from the collection of Count d'Andlau at the castle of Voré, Remalard (Orne, in France), shows yet other variations in the dress and the jewels.