Nostradamus is supposed to be a great astrologer whose predictions have always come true so far. However I consider it to be the characteristic of his writing that people discover this only after those events are taken place.
My fav. author Koenraad Elst writes the truth about this fake astrologer.
Michel Nostredame was a French physician and astrologer of whom some writings have been preserved. These include private letters, horoscope interpretations and his great speciality: jam recipes. And two books on medicine, one completely plagiarized and one containing remedies against the plague of which none works. In fact, he had been thrown out at the medical faculty and had no medical diploma, though he had some experience as a self-taught pharmacist. His writing style is totally different from that of the Centuries. He was a very bad astrologer whose predictions were invariably wrong, yet he managed to build himself a reputation. Thus, he gained fame with the “prediction” in the Centuries of the death of an unnamed king, then thought to refer to French king Henri II, who died in a duel with a young opponent by getting a spear through his helmet and into his eye, then dying a cruel death after a few days of agony (I.35: “Le Lyon jeune le vieux surmontera…”). In fact, not long before the event ND himself had predicted a long life to the king. He ingratiated himself with the queen-widow by predicting a long life for her young son, who nevertheless went on to die at age 24. He also revealed that her sister, married to the king of Spain, was pregnant; she sent presents to celebrate the good news, but her sister turned out not to be pregnant yet. And so on.
So basically this astrologer was nothing but the kind of astrologer they show in Hindi movies. No he was worse than that, he was not merely an incompetent astrologer but as thief too.
ND was a thief and a fraud. In his young days, he travelled for some years, not to Egypt and Persia as the myth would have it, but only in the Romance-speaking countries. In 1545, he stayed at a monastery in Cambron, in the Earldom of Hainault, now in Belgium, then part of the Holy Roman Empire, but on the frontier with the earldom of Flandres, then the richest vassal of the French kingdom. There, he got to see a manuscript written by abbot Yves de Lessines in 1323-28. We can imagine that because of his reputation as a mystery man, the monks showed him the enigmatic text hoping that he could make sense of it. At any rate, he stole the manuscript and later published it under his own name: Les Centuries. He first published a few quatrains, testing the waters for any reactions to his plagiarism.