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In page Slavs:

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The oldest mention of the Slavic ethnonym is from the 6th century AD, when Procopius, writing in Byzantine Greek, used various forms such as Sklaboi (Σκλάβοι), Sklabēnoi (Σκλαβηνοί), Sklauenoi (Σκλαυηνοί), Sthlabenoi (Σθλαβηνοί), or Sklabinoi (Σκλαβῖνοι),[1] and his contemporary Jordanes refers to the Sclaveni in Latin.[2] The oldest documents written in Old Church Slavonic, dating from the 9th century, attest the autonym as Slověne (Словѣне). Those forms point back to a Slavic autonym, which can be reconstructed in Proto-Slavic as *Slověninъ, plural Slověne.[citation needed]