From 1100 to 1200 AD, monks were sent to the Andalusian Caliphate, in southern Spain, to learn and translate classical knowledge into Latin. The crusaders having come back from living in the Middle East, also translated the Arabic classic texts from Arabic into Latin, which at that time was the language of all European scholars.

Around 12th century AD in Europe, astrology was gaining popularity largely through St. Thomas Aquinas, who said that 'the celestial bodies are the cause of all that takes place in the sublunary world.'

In time, astrology was part of the curriculum of all those aspiring to become priests in the Roman Catholic Church.

Roger Bacon, one of the greatest thinkers of all time, was a skilled astrologer whose encyclopedic knowledge embraced philosophy, science, mathematics, physics and geometry. He was convinced that the planets influenced human life.