Quattuor/feower

Four are the elements from which the rainbow takes its colours Quadricolor enim est . ex omnibus elementis in se rapit species.  De celo enim trahit igneum colorem . de aquis purpureum . de aere album de terris collegit nigrum. For it [the rainbow] is of four colours, and takes its appearance from all of…

How many colours were there in a medieval rainbow?

This is the sign of my covenant, that I make between me and you and all living creatures for all generations, that is that I will set my rainbow in the clouds and it will be a sign of my covenant between me and the earth: when I cover the heavens with the clouds, then…