The Origin of Dom and Dona

Almost everyone recognizes Dom. Far fewer people know that it is worn down Latin, or that Portugal used it far more sparingly than Spain used its own version. That second point is the one most often got wrong, and it is the interesting part.

It starts as the Latin for lord

The root is dominus: lord, master, the owner of the house. In late spoken Latin it wore down to domnus, and from there to one syllable. Portuguese kept it as Dom. The feminine domina became Dona.

The same root is all over Europe. Spanish has don and dona, Italian don and donna, and the Italian word for woman is now simply donna, so an Italian saying it is saying mistress of the house without thinking about it. Madonna is my lady. And the champagne is named for a Benedictine monk, because Dom is also how the order addresses its senior members, which has nothing to do with nobility at all.

Portugal was strict about it, and Spain was not

Here is the part worth taking away. In Spain, don started as a mark of royalty and the highest nobility and then loosened over the sixteenth and seventeenth centuries until it reached more or less any man of local standing. By the end it was closer to a courtesy than a rank, and in parts of southern Italy under Spanish rule it went the same way.

Portugal did not follow. Dom stayed narrow: kings and queens, princes and princesses, and a thin layer of the highest nobility, granted by the crown and inherited under rules. It was not something a town could decide to call you. Portuguese monarchs are named with it as a matter of course, so the histories give you Dom Afonso Henriques, the first king, and Dom Manuel I, who was on the throne for the voyages to India and whose personal device was the armillary sphere on our seal.

So a Portuguese Dom and a Spanish don are not the same word doing the same job, and treating them as interchangeable is the usual mistake.

Dona, and how it drifted

Dona followed the strict rule at first, for queens and the highest ranks: Dona Maria, Dona Filipa. But it also slid into ordinary polite speech in a way Dom never did, and in Portugal and Brazil today Dona before a first name is a warm, respectful way to address a woman with no suggestion of rank whatever. It is what you would call a friend's mother.

That gives the two words different weather. Dom still sounds formal and a little grand. Dona can be either, depending entirely on who is saying it.

The law stopped recognizing any of it in 1911

Portugal became a republic on 5 October 1910, and the Constitution of 1911 abolished noble titles. No Portuguese title has had legal standing since. Nobody grants them, no register of them is kept, and no authority stands behind them. Families who had them still know they had them, and the words stayed in the language, which is the ordinary fate of a title after the state stops counting it.

What we are doing with the word

Using it the way it survives: as a form of address you can be given for the affection of it. A Casa do Padrao certificate styles you Dom or Dona on a sheet of paper with your name and a plot at Cascais. It is not a legal title, it does not come from the Portuguese state or from any institution, and it confers nothing. The legal notice says all of that in a good deal more detail, and the certificate page shows you exactly what the sheet looks like.