The walls of the church contain the earliest known inscriptions in Nuskhuri or Nuskha-Khutsuri, one of the versions of the early Georgian alphabet, dating from 835. The earliest known examples of Mkhedruli, a currently used Georgian script, are also found in the Ateni Sioni church and date to the 980s. One of the inscriptions on the church commemorates Adarnase I of Tao-Klarjeti, the first documented Georgian Bagratid nobleman who was the father of Ashot I, the founder of the new royal line of Georgia.[5]