Trajan is a serif typeface designed in 1989 by Carol Twombly for Adobe based on the letterforms used in the inscription on Trajan's Column in Rome. As the inscription only included capital letters, Trajan is an all-caps typeface, though an updated version includes small caps. While Twombly's version was very literal, other interpretations predated hers from the 1920s-1930s with added lowercase letters, though some like Warren Chappell's had a distinctly medieval lowercase.

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trajan Pro Regular
Trajan is an old style serif typeface designed in 1989 by Carol Twombly for
Adobe. The design is based on the letterforms of capitalis monumentalis or
Roman square capitals, as used for the inscription at the base of Trajan’s Col-
umn from which the typeface takes its name. Since the inscription and its
writing form manifests in only one case, Trajan is an all-capitals typeface. In-
stead, small caps are commonly used, and a more complete set of glyphs con-
tained in Trajan Pro (a 2001 update of the original typeface) includes a lower
case of small caps.
Although Twombly was the first to do a very literal translation of the Tra-
jan inscription into type, a number of interpretations (with added lowercase
alphabets) predate Twombly’s, particularly Emil Rudolf Weiss’ “Weiss” of 1926,
Frederic Goudy’s 1930 “Goudy Trajan,” while Warren Chappell’s “Trajanus” of
1939, while having similar forms for capitals has a markedly medieval lower-
case. There are also numerous prominent typefaces that are not revivals, but
owe a very clear debt to the Trajan letterforms, most notably Hermann Zapf’s
1955 Optima.
http://en.wikipedia.org/wiki/Trajan_(typeface
Carol Twombly (born 1959) is
an American calligrapher and
typeface designer who has
designed many typefaces, in-
cluding Trajan, Myriad and
Adobe Caslon. She worked as a
type designer at Adobe Systems
from 1988 through 1999, dur-
ing which time she designed,
or contributed to the design
of, many typefaces. She retired
from type design in early 1999,
to focus on her other design
interests, involving textiles
and jewelry.