Egypt, Alexandria. Constantius I as Caesar, 293-305. Tetradrachm. (Potin, 18.00 mm, 7.01 g). Dated RY 3 = AD 294/5. ΦΛA KωCTANTIOC K Laureate, draped and cuirassed bust right seen from the front. Rev. Draped bust of Harpokrates facing right, wearing pshent crown, hair in “youth lock”, right hand to lips; L Γ (date) across fields. Geissen -. Dattari-Savio 6065. K&G 121.22. RPC X Online 76179. BMC -. Milne -. Curtis X – 2122 (believed unique). Demetrio -. Emmett 4189 (5). Extremely rare, only five known to RPC. Dark brown patina, slight roughness. Very Fine. From the Dr. Thomas E. Beniak Collection, purchased from Harlan J. Berk, 18 January 2003. Ex CNG, E-Auction 556, 21.02.2024, lot 429. Constantius I ‘Chlorus’ is the glorious Roman general of Illyrian origin based in Trier, was created Caesar by Maximian. He was the father of Constantine I the Great and as such the founder of the Constantinian imperial dynasty that ruled from 305 AD to 363 AD with six sovereigns. Extremely rare coin of valuable preservation, especially for its reverse with the bust of the child Harpokrates, a Hellenised Egyptian deity, shown here in its commonly known official version.