 Medieval notions of probability exhibit parallels to all modern groups of probability concepts. Endoxic and juridical probability are species of quasi-logical probability because they arise from evidential support for holding a proposition true. Endoxa, that is, probable opinions of others, are evidence for holding a proposition true. The witness testimony and indicia of juridical notions of probability are also, of course, kinds of evidence. The second category of modern interpretations of probability is related to medieval probability understood as a specific amount of confidence in the truth of a proposition. It is the confidence that characterizes opinions as the lowest rank of an epistemological order leading via fides (standing for fully confident belief or faith) to knowledge. Finally, probability is a feature of the world in modern propensity views, as well as for the medieval semantic notion of probability. Whether this also holds for proto-frequentist probability is, as indicated, a matter of interpretation.