The ruins of the Church of the Holy Trinity most likely date to the early Middle Ages, approximately the VI-VII centuries (with a possible extension of the dating to the beginning of the X century).
This is indicated by the absence of decorative ornamentation and complex stone relief carving, a characteristic feature of early Christian monuments in the region.
With a high degree of probability, the church was not domed.
Even early domed churches of the V-VII centuries typically preserve traces of the transition to the drum, such as pilasters, wall thickening, or elements of vaulting.
No such features are observable in the surviving ruins.
It is most likely that the Church of the Holy Trinity near Manglisi was a single-nave church.
This interpretation is supported by the small overall volume of the structure, within which it would have been impossible to accommodate a three-nave basilica.
At the same time, despite the elongated longitudinal walls, the church was hardly a hall-type structure (a rectangular building with the entrance on the short side), since churches of this type are usually characterized by thinner walls and, as a rule, more developed architectural decoration — features that are absent in this monument.