ˌɪnfɚmˈeɪʃən ɐbˌaʊt kɹˈɪstʃən bˈɪʃəps ʌv kˈæstʃəlˌoʊ ɐpˈɪɹz ɪnðə fˈɜːst hˈæf ʌvðə fˈoːɹθ sˈɛntʃɚɹi ˌeɪdˈiː θɹuː pɑːɹtˈɪsɪpˈeɪʃən baɪ ɪts bˈɪʃəps ɪnðə kˈaʊnsəl ʌv ɛlvˈiəɹə ænd ðæt ʌv sˈɑːɹdɪkə.
Information about Christian bishops of Castulo appears in the first half of the fourth century AD through participation by its bishops in the Council of Elvira and that of Sardica.