where does the term dark horse come from
Dark horse The term began as horse racing parlance for a race horse that is unknown to gamblers and thus difficult to place betting odds on.
Dark Ages (historiography) The idea of a Dark Age originated with the Tuscan scholar Petrarch in the 1330s.[15][12] Writing of the past, he said: "Amidst the errors there shone forth men of genius; no less keen were their eyes, although they were surrounded by darkness and dense gloom".[16] Christian writers, including Petrarch himself,[15] had long used traditional metaphors of 'light versus darkness' to describe 'good versus evil'. Petrarch was the first to give the metaphor secular meaning by reversing its application. He now saw Classical Antiquity, so long considered a 'dark' age for its lack of Christianity, in the 'light' of its cultural achievements, while Petrarch's own time, allegedly lacking such cultural achievements, was seen as the age of darkness.[15]