Full Idea
Late medieval nominalism defended the sovereignty of God as incompatible with there being an order in nature which by itself defined good and bad.
Clarification
'Nominalists' were opponents of Plato's theory of Forms
Gist of Idea
Nominalists defended the sovereignty of God against the idea of natural existing good and evil
Source
Charles Taylor (Sources of the Self [1989], §3.3)
Book Reference
Taylor,Charles: 'Sources of the Self' [CUP 1992], p.82
A Reaction
Part of their attack on Platonism. But what made them place such a high value on the sovereignty of God?