Located in Region X. The construction of this bath took extremely long: it begun named as Constantinianae, but it was completed as Theodosianae. Due to the altitude of Region X, the baths were probably supplied by the Valens Waterway (Crow et al., 2008, p. 10, 13).
According to the Parastaseis Syntomoi Chronikai (73-74), the baths were adorned with statues.
The bath has falsely attributed to Constantine the Great (r. 306-337) by sources such as the Chronikai (supported by Eusebius who merely stated Constantine built baths in general), but it was actually built by his son Constantius II (r. 337-361).
The baths were used for Easter Celebration in 404 by John Chrysostom, who was condemned after quarreling with empress Eudoxia in 403 over her silver statue.
A Russian account from the 14th century still thought the baths to be in function, albeit at reduced capacity. Majeska, 1984, p. 247 thinks these are actually the ones built by emperor Basil I above the Boukoleon, near the Pharos terrace, which was decorated by Constantine VII (Cf. 'Bath of Leo VI?') (EDITORS: check).