Overview
Trajan is a 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 Column from which the typeface takes its name. Trajan is an all-capitals typeface, as the Romans did not use lowercase letters. Twombly created the design taking inspiration from a full-size picture of a rubbing of the inscription. It is well known for appearing on many film posters.
Background
The capitals on Trajan's Column have long been an inspiration to many artists and students of lettering. The calligrapher and type designer Edward Johnston in his book Writing & Illuminating & Lettering (1906) wrote that "the Roman capitals have held the supreme place among letters for readableness and beauty. They are the best forms for the grandest and most important inscriptions." Trajan letterforms were used for many years for signs in British public buildings, including government offices.
From Wikipedia (CC BY-SA 4.0).