Some ancient scholars believed Homer to have been an eyewitness to the Trojan War; others thought he had lived up to 500 years afterwards. Contemporary scholars continue to debate the date of the poems. A long history of oral transmission lies behind the composition of the poems, complicating the search for a precise date. At one extreme, Richard Janko has proposed a date for both poems to the eighth century BC based on linguistic analysis and statistics. Barry B. Powell dates the composition of the "Iliad" and the "Odyssey" to sometime between 800 and 750 BC, based on the statement from Herodotus, who lived in the late fifth century BC, that Homer lived four hundred years before his own time "and not more" (καὶ οὐ πλέοσι), and on the fact that the poems do not mention hoplite battle tactics, inhumation, or literacy.