In Hellenistic times, especially during the 5th century BCE, as Apollo Helios he became identified among Greeks with Helios, the personification of the Sun.
ɪn hˌɛlənˈɪstɪk tˈaɪmz, ɪspˈɛʃəli dˈʊɹɹɪŋ ðə fˈɪfθ sˈɛntʃɚɹi bˌiːsˌiːˈiː, æz ɐpˈɑːloʊ hˈɛlɪˌoʊz hiː bɪkˌeɪm aɪdˈɛntᵻfˌaɪd ɐmˌʌŋ ɡɹˈiːks wɪð hˈɛlɪˌoʊz, ðə pɜːsˈɑːnɪfɪkˈeɪʃən ʌvðə sˈʌn.