Zeno (or Zenon, Greek: Ζήνων; 3rd century BC), son of Agreophon, was a native of the Greek town of Caunus in lower Asia Minor. He moved to Philadelphia in Egypt and became a private secretary to Apollonius, the finance minister to Ptolemy II Philadelphus and Ptolemy III Euergetes during the 3rd century BC. He work under Apollonius the dioiketes.
A cache of over 2,000 Greek and Demotic letters and documents written on papyri by Zeno were discovered in the 1900s and are referred to as the Zenon Archive or Zenon Papyri.
A substantial part of the Zenon Papyri are now online and grammatically tagged at the Perseus Project hosted at Tufts University.