Which 12th-century historical chronicle by King Béla's anonymous notary (Anonymus) documents the existence of early Romanian and Slavic political formations in Transylvania led by Gelou, Glad, and Menumorut during the 9th–10th centuries?
- AGesta Hungarorum
- BChronicon Pictum (Vienna Illuminated Chronicle)
- CAlexiad by Anna Komnene
- DDe Administrando Imperio by Constantine VII Porphyrogenitus