Who told the first story in The Canterbury Tales?

The first storyteller on the route to Canterbury is the Knight. The Knight has led a more adventurous life than most of the pilgrims (so he is likely to know some of the better stories), and he is also one of the pilgrims who hasn't made any special friends or enemies among the group. (The Reeve and the Miller are already at daggers drawn, while the Summoner and the Pardoner seem to have a thing going on).