Colonna Traiana

Trajan's Column is a monument erected in Rome to celebrate the conquest of Dacia by the emperor Trajan, evoking all the highlights of that territorial expansion. The cell at its base was used as a sepulcher for the remains of the emperor.
es.wikipedia.org/wiki/Columna_de_Trajano

Erected for the Roman Emperor Trajan and his forum.

Trajan's Column (Italian: Colonna Traiana) is a Roman triumphal column in Rome (one of the two, the other is Colonna di Marco Aurelio not far from here), that commemorates Roman emperor Trajan's victory in the Dacian Wars. It is located in Trajan's Forum, built near the Quirinal Hill, north of the Roman Forum. Completed in AD 113, the freestanding column is most famous for its spiral bas relief, which artistically describes the epic wars between the Romans and Dacians. Its design has inspired numerous victory columns, both ancient and modern.

The structure is about 30 metres (98 feet) in height, 35 metres (115 feet) including its large pedestal. The shaft is made from a series of 20 colossal Carrara marble[a] drums, each weighing about 32 tons,[2] with a diameter of 3.7 metres (12.1 feet). The 190-metre (620-foot) frieze winds around the shaft 23 times. Inside the shaft, a spiral staircase of 185 steps provides access to a viewing platform at the top. The capital block of Trajan's Column weighs 53.3 tons, which had to be lifted to a height of c. 34 metres (112 feet).

Here stands one of the four ornate columns in the middle of the cupola-decorated churches.