anchor: Legend claims that the city of Byzantium was founded around 660 b.c. by a Greek named Byzas, after the Delphic Oracle had bidden him to build his city  opposite the Land of the Blind.  
positive: Around 660 b.c. , according to the legend, the city of Byzantium was founded by a Grek named Byzas.
negative: Legend claims that the city of Byzantium was founded around 999 b.c.