The fill in this cistern is Byzantine with considerable admixture of Greek IV-III c. B.C. Coins:
7 March 1932 #9
9 March 1932 #1
10 March 1932 #1-#2
11 March 1932 #2
12 March 1932 #1 ... 11th-12th c. A.D.
The East Chamber of a double cistern lying between the northeast corner of the Theseion and the Annex to the Stoa of Zeus Eleftherios. ... Both chambers went out of use as water containers simultaneously ... Ca. 200 B.C.
Cistern-system west of the Stoa of Zeus. Two chambers connected by a tunnel, each with two fills. Lower fill in south chamber contemporary with upper fill in north chamber, at the end of the 4th c. B.C ... Ca. 375-160 B.C.