Known in 498/9 (Crow et al., 2008, p. 10).

Located in the Helenianae quarters (near the Harbour of Theodosius, today Samatya), probably on the location of the present Armenian Surp Kevork church which houses a holy spring. According Yegül, the baths were part of a palace-church complex dedicated to Helena, the mother of Constantine I. The baths were functioning into the 5th-6th centuries, probably serving the local community as well as the palace (Yegül, 2008, p. 185). According to Müller-Wiener, 1977, p. 200, the spring of Sulu Manastır (Theotokos Peribleptos) provides a topographical reference point for the adjacent Helenianai Palace. Janin wonders if these are the same as the Exakionion bath. Berger, 2022, p. 375 seems to give evidence to support that Helena's palace stood on the same place as the later Peribleptos Monastery.

Theophanes records that a certain Olympios, an Arian, died miserably in one of Heleniani's pools after uttering blasphemies (AM 5991).

Crow et al., 2008, p. 117: "Andréossy indicates another Ottoman channel leaving the taksim outside the Land Walls at Eğrikapı, passing southwards and under the Valens line, and following the west side of the Lycus valley towards the Langa Bostanı, before folling the contours westwards to Samatya, where the Stoudios basilica (with cistern B9/1) is located. Çeçen's maps, based on early twentieth-century records, show much the same and it is conceivable that such a branch existed in the Byzantine period."