Two words will fully summarize this strange woman, so interesting to study, whose influence left such deep traces on France. These two words are dominion and astrology. Catherine de' Medici was excessively ambitious; she had no passion but for power. Superstitious and a fatalist, as many a man of superior mind has been, her only sincere belief was in the occult sciences. Without this twofold light, she must always remain misunderstood; and by giving the first place to her faith in astrology, a light will be thrown on the two philosophical figures of this Study.
There was a man whom Catherine clung to more than to her children; this man was Cosmo Ruggieri. She gave him rooms in her Hôtel de Soissons; she had made him her chief counselor, instructing him to tell her if the stars ratified the advice and common-sense of her ordinary advisers.
Certain curious antecedent facts justified the power which Ruggieri exerted over his mistress till her latest breath. One of the most learned men of the sixteenth century was beyond doubt the physician to Catherine's father, Lorenzo de' Medici, Duke of Urbino. This leech was known as Ruggiero the elder (_vecchio Ruggier_, and in French _Roger l'Ancien_, with authors who have written concerning alchemy), to distinguish him from his two sons, Lorenzo Ruggiero, called the Great by writers on the Cabala, and Cosmo Ruggiero, Catherine's astrologer, also known as _Roger_ by various French historians. French custom altered their name to Ruggieri, as it did Catherine's from Medici to Medicis.
The elder Ruggieri, then, was so highly esteemed by the family of the Medici that the two Dukes, Cosmo and Lorenzo, were godfathers to his sons. In his capacity of mathematician, astrologer, and physician to the Ducal House--three offices that were often scarcely distinguished--he cast the horoscope of Catherine's nativity, in concert with Bazile, the famous mathematician. At that period the occult sciences were cultivated with an eagerness which may seem surprising to the sceptical spirits of this supremely analytical age, who perhaps may find in this historical sketch the germ of the positive sciences which flourish in the nineteenth century--bereft, however, of the poetic grandeur brought to them by the daring speculators of the sixteenth; for they, instead of applying themselves to industry, exalted art and vivified thought. The protection universally granted to these sciences by the sovereigns of the period was indeed justified by the admirable works of inventors who, starting from the search for the _magnum opus_, arrived at astonishing results.