Dionysodorus of Amisene (1st century AD) was a Greek mathematician fromPontus, now on theBlack Sea coast ofTurkey. He was briefly described byStrabo, as one of the learned men of the city of Amisus.^[1][2] Despite the similarity of his demonym to the inland city ofAmaseia, where Strabo was born, translators H. C. Hamilton and W. Falconer instead footnote Amisus as being the modern citySamsun, near Amaseia on the coast. Amisene is a name for the region containing both cities.^[2]

Strabo distinguishes him from Dionysodorus of Melos, a geometer,^[2] whomPliny the Elder describes as having calculated the circumference of the Earth, less accurately than the older calculation ofEratosthenes. He should also be distinguished fromDionysodorus of Caunus, who studiedconic sections.^[1]

Dionysodorus of Amisene was long thought to be the Dionysodorus who studied conic sections until, in the early 20th century,Wilhelm Crönert [de] found from a papyrus newly excavated atHerculaneum a connection from the study of conics to Dionysodorus of Caunus and his son, also named Dionysodorus, dating them to centuries before the time that Strabo wrote about.^[1][3]

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