According to the website Eternally Cool, when expanding the abbreviations, the base of the column is inscribed with the following: SENATUS POPULUSQUE ROMANUS IMPERATORI CAESARI DIVI NERVAE FILIO NERVAE TRAIANO AUGUSTO GERMANICO DACICO PONTIFICI MAXIMO TRIBUNICIA POTESTATE XVII IMPERATORI VI CONSULI VI PATRI PATRIAE AD DECLARANDUM QUANTAE ALTITUDINIS MONS ET LOCUS TAN RIBUS SIT EGESTUS
Which translates to The Senate and People of Rome. To the Divine Emperor Caesar Nerva Trajan Augustus Germanicus Dacicus, son of Nerva, Pontifex Maximus, invested with the Tribunican Power for the 17th time, Consul for the 6th time, Father of the Fatherland, to testify, this place and tower of such height was carried out.
plaster casts at the Victoria and Albert Museum
plaster casts at the Museum of Roman Civilization