pˈɜːsɪəs; sˈiː. wˈʌnhˈʌndɹɪd fˈɪfti bˌiːsˈiː wʌz ɐn ˈeɪntʃənt ɡɹˈiːk dʒˈiːoʊmˌɪɾɚ, hˌuː ɪnvˈɛntᵻd ðə kˈɑːnsɛpt ʌv spˈɪɹɪk sˈɛkʃənz, ɪn ɐnˈælədʒi tə ðə kˈɑːnɪk sˈɛkʃənz stˈʌdid baɪ ɐpəlˈoʊnɪəs ʌv pˈɜːɡə.
Perseus (; c. 150 BC) was an ancient Greek geometer, who invented the concept of spiric sections, in analogy to the conic sections studied by Apollonius of Perga.