It is the location of the ancient Roman complex of palaces and temples Felix Romuliana (Serbian: Феликс Ромулијана / Feliks Romulijana), built by Emperor Galerius[3][4] in Dacia Ripensis.

Galerius started construction in 298 (after a victory over the Sasanian Empire that brought him admiration and glory) to mark the place of his birth.

The complex of temples and palaces served three main purposes - a place of worship of his mother's divine personality, a monument to his deeds as emperor, and a luxurious villa for Galerius.

The structures were first evaluated in 1835 by Baron von Herder, a Saxon mine entrepreneur, in the "Bergmänische Reise in Serbie im Jahre 1835".

The Austro-Hungarian naturalist, geographer, ethnographer and archaeologist Felix Philipp Kanitz (who has earned great respect in Serbia and Bulgaria through his works on the South Slavs) was especially interested in Gamzigrad and visited the ruins on two occasions, in 1860 and in 1864 when he drew the then condition of the ramparts and towers, included in his works on Serbia, printed in Vienna and Leipzig.

The academic professor Dr. Dragoslav Srejovic was in charge of the research in 1970, he is the one regarded as positioning the monument among world archaeology.

[6] Among the most important finds from the site are portraits of Roman emperors made from porphyry and coins that help to accurately date the complex.

A sculpture of Diana, the goddess of hunt, was unearthed in July 2010 by German and Serbian archeology teams, experts said that horse and a rider is missing which symbolizes victory over the barbarians.

The vestibulum (accessory hall) is preserved with marble plate and pillars of green serpent brecha and red granite.