The marble is a Hellenistic or Roman copy of a bronze original by the Greek sculptor Leochares, made between 330 and 320 BCE.
ðə mˈɑːɹbəl ɪz ɐ hˌɛlənˈɪstɪk ɔːɹ ɹˈoʊmən kˈɑːpi əvə bɹˈɑːnz ɚɹˈɪdʒɪnəl baɪ ðə ɡɹˈiːk skˈʌlptɚ lˈiətʃɛɹz, mˌeɪd bᵻtwˌiːn θɹˈiːhˈʌndɹɪd θˈɜːɾi ænd θɹˈiːhˈʌndɹɪd twˈɛnti bˌiːsˌiːˈiː.