Theophylact Simocatta
Subsequent information about Slavs' interaction with the Greeks and early Slavic states comes from the 10th-century "De Administrando Imperio" (DAI) by Emperor Constantine VII Porphyrogenitus, the 7th-century compilations of the "Miracles of Saint Demetrius" (MSD) and the "History" by Theophylact Simocatta. DAI mentions the beginnings of the Croatian, Serbian and Bulgarian states from the early 7th to the mid-10th century. MSD and Theophylact Simocatta mention the Slavic tribes in Thessaly and Macedonia at the beginning of the 7th century. The 9th-century "Royal Frankish Annals" (RFA) also mention Slavic tribes in contact with the Franks.