"[7][8] Trajan letterforms were used for many years for signs in British public buildings, including government offices.

Many looser interpretations (often with an invented lowercase) predate Twombly's, particularly Emil Rudolf Weiss' "Weiss" of 1926, Frederic Goudy's Forum Title, Hadriano and "Goudy Trajan", and Diotima by Gudrun Zapf-von Hesse, while Warren Chappell's "Trajanus" of 1939, while having similar forms for capitals has a markedly medieval lowercase.

[6] Alastair Johnston's 1990 review of Trajan noted this heritage, saying that it "outdoes anything old Fred Goudy ever produced.

[1] Twombly's digitisation of Trajan has become very popular, as seen in its widespread presence on movie posters, television shows, and book covers.

In 2012 the existing OpenType version was significantly revised as "Trajan Pro 3," with Robert Slimbach adding four additional weights as well as Cyrillic and Greek glyphs.