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I am reading about Titus Flavius Sabinus (consul AD 47) and cannot find meaning of T. f. T. n. in his full name as written in Wikipedia, "Titus Flavius T. f. T. n. Sabinus."

All I have found is a list of roman consuls and military tribunes where similar abbreviations are used with various letters.

Searching for TFTN or T. f. T. n. returns modern abbreviations like "Thanks For The Numbers," "The Free Times Newspaper," nothing relevant.

Reading the wiki page history I see no indication why this abbreviation was inserted.

My guess would be T. f. T. n. is abbreviation of province or military regiment?

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    It's a form of filiation, I'll let some smarter folk give the full answer. – Steve Bird Jul 1 at 12:45
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    Hi, I cleaned up your question a little—some minor English grammar tweaks and so on. Two things I thought maybe you’d like to know: shortening a word or words to just the first letter or letters is an “abbreviation,” an “acronym” is specifically an abbreviation that is meant to be read as a word (e.g. “Strategic Homeland Intervention Enforcement & Logistics Division” read as “SHIELD”). Second, please only use code formatting for computer code fragments, as this can in some cases cause accessibility problems (e.g. a screen reader for the blind has to read it “as code” and that may not be good). – KRyan Jul 2 at 16:12
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It stands for "Titi filius Titi nepos", meaning "son of Titus and grandson of Titus" (filius and nepos mean son and grandson, respectively).

This is because the consul Titus Flavius Sabinus was the son of the (non-consul) Titus Flavius Sabinus, who was in turn the son of Titus Flavius Petro. So as @SteveBird observed, the abbreivations are "filiation", i.e. the part of the name describing paternity.

Note that we can determine both T.'s stand for Titus because there's a set formula for how these names are abbreviated. In Roman names, the first part, known as praenomen (in examples above, "Titus") are the personal names. However, there were only ever about three dozens of these, and only ten or so were common in the historical record.

As a result, there are standardised abbreviations:

  • Aulus = A.
  • Gaius = C.
  • Gnaeus = Cn.
  • Decimus = D.
  • Lucius = L.
  • Marcus = M.
  • Publius = P.
  • Quintus = Q.
  • Titus = T.
  • Tiberius = Ti.

Roman naming conventions are very annoying.

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The personal name in the Roman naming system is composed of several independent elements.

A Roman male name of the late Republic such as

Q. Numerius Q. f. Vel. Rufus comprises the following:

  1. the praenomen or the old individual name (siglum Q = Quintus ),

  2. the gentile or family name (Numerius),

  3. the filiation, which gives the praenomen of the father in the genitive (usually as a siglum) before the abbreviated f(ilius) (Quinti filius 'son of Quintus') and in highly official texts also the praenomen of the grandfather (cf. Fasti consulares, 260 BC: Cn. Cornelius L. f. Cn(aei) n(epos) Scipio Asina),

  4. the indication of the tribus in a defined abbreviation (Vel(inā tribū): abl. of quality), and

  5. the cognomen , which as an individual cognomen was the younger individual name and as a hereditary cognomen served to differentiate the branches (stirpes) of noble families (Gens) (for example, combined in Scipio Asina). Since use of the cognomen was not a universal custom even in the late Republic (for example, it is missing for the victor over the Cimbri, C. Marius [I 1] and the triumvir M. Antonius [I 9]) and the oldest son usually adopted his father’s praenomen, the system did not always permit identification of a person, especially between generations.

However, it generally fulfilled its function superbly even in a large society.

–– The above adapted in formatting from: Rix, Helmut (Freiburg), García-Ramón, José Luis (Cologne), Streck, Michael P. (Munich) and Haas, Volkert (Berlin), “Personal names”, in: Brill’s New Pauly, Antiquity volumes edited by: Hubert Cancik and , Helmuth Schneider, English Edition by: Christine F. Salazar, Classical Tradition volumes edited by: Manfred Landfester, English Edition by: Francis G. Gentry. http://dx.doi.org/10.1163/1574-9347_bnp_e915460

So we see that Wikipedia is a highly official Roman text and as such uses the filiation of father and grandfather of Titus Flavius T.f. T.n. Sabinus, which very creatively were also named Titus Flavius Sabinus (Titus Flavius T.f. Sabinus ), just like a few others…

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