Full Idea
Ramsey gave an axiomatic treatment of preference in the face of uncertainty, when applied to a particular agent.
Gist of Idea
Ramsey gave axioms for an uncertain agent to decide their preferences
Source
report of Frank P. Ramsey (Truth and Probability [1926]) by Donald Davidson - Truth and Predication 2
Book Reference
Davidson,Donald: 'Truth and Predication' [Belknap Harvard 2005], p.32
A Reaction
This is evidently the beginnings of Bayesian decision theory.