In Medieval England, when someone saw a comet, it was important enough to be written in the history books. Since this was a time when science, history, and religion were still understood as being tightly interwoven with one another, scribes would not only record when a comet had been seen, but would usually provide some sort of interpretation connecting it with the political circumstances of the day and with the will of God. Not only does this give us insight into the workings of the medieval mind, it is helpful for for astronomers and for historians, both of whom can use these records as reference points to date when certain terrestrial or astral events took place. Ill Omens to Religous Icons is an invaluable resource for scholars, students, and anyone with an interest in these topics. Organized in chronological order, it provides excerpts from several medieval histories describing the appearance of comets, along with original translations of these passages from Latin into English. Ill Omens also gives historical and exegetical context to these historical descriptions to help the reader better understand why the writers thought and said what they did about these strange cosmic phenomena.