Secretaries were also used to translate letters both received and those being written, since not all the Habsburgs had a common language, even within their own family. Most members of the dynasty mastered at least two languages, learning the second one as adults, and especially the Austrian branch of the family also used Latin for practical purposes. Maximilian had in 1477 learned French to be able to converse with his bride, Mary of Burgundy, and the emperor also used French with his children, Philip and Margaret. Margaret learned Spanish as the bride of Prince Juan, whereas Charles V learned the language only after he entered Spain as its king in 1517. His equally French-speaking younger sister, Mary, learned German in Austria. Charles’s daughters, María and Juana, wrote mainly in Spanish, which their uncle Ferdinand could understand, but their aunt Mary of Hungary could not.
On the language skills of the Habsburgs in the 15th and 16th centuries: Maximilian I, Holy Roman Emperor; his daughter Marguerite of Austria; his grandchildren Charles V, Holy Roman Emperor, Mary of Hungary, and Ferdinand I, Holy Roman Emperor; and his great-grandchildren Maria of Austria and Juana of Austria.