Abstract
Theognostos is a well-known author of a surviving orthographical work and a lost history of the revolt of Euphemios in Sicily. Although the dating of the Orthography was the subject of controversy in the distant past, the issue has long been considered as settled: the work is generally thought to have been dedicated to Emperor Leo V , not Leo VI , as the opposite opinion held. The present article reexamines the problem on the basis of a re-evaluation of all available evidence as well as by bringing new parallels into the discussion. The solution reached goes some way in-between the two previous propositions. According to it, the Orthography would still derive from Theognostos' teaching experience in the first half of the ninth century , but would date from mid-century. The dedication of the author's magnum opus would have taken place much later, in the very early reign of Leo VI, for reasons also discussed here. Thus, Theognostos emerges as a ninth-century figure and a contemporary of Patriarch Photios