This one of several inscriptions that record dedications made by ex-ephebes in Egypt; see OGIS_176.
On behalf of king Ptolemaios called Alexandros, the god Philometor, this place was dedicated to the very great god Souchos by those who were ephebes in the class of Asklepiades son of Asklepiades during the seventh year, with Ptolemaios son of Ptolemaios as their president and secretary. Its dimensions were 14 cubits from south to north, and 22 cubits from west to east, up to the race course. Year 19, Mecheir 20.
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