during its early years under the Greek and Roman Empires, as the centralized Roman power waned, the dominance of the Catholic Church was the only consistent force in Western Europe. Until the Age of Enlightenment, Christian culture guided the course of philosophy, literature, art, music, and science. Christian disciplines of the respective arts have subsequently developed into Christian philosophy, Christian art, Christian music, Christian literature, etc. Art and literature, law, education, and politics were preserved in the teachings of the Church, in an environment that, otherwise, would have probably seen their loss. The Church founded many cathedrals, universities, monasteries and seminaries, some of which continue to exist today. Medieval Christianity created the first modern universities. The Catholic Church established a hospital system in Medieval Europe that vastly improved upon the Roman valetudinaria. These hospitals were established to cater to "particular social groups marginalized by poverty, sickness, and age", according to historian of hospitals, Guenter Risse. Christianity also had a strong impact on all other aspects of life: marriage and family, education, the humanities and sciences, the political and social order, the economy, and the arts. Christianity had a significant impact on education and science and medicine as the church created the basis of the Western system of education, and was the sponsor of founding universities in the Western world as the university is generally regarded as an institution that has its origin in the Medieval Christian setting. Many clerics throughout history have made significant contributions to science and Jesuits in particular have made numerous significant contributions to the development of science. Some scholars state that Christianity contributed to the rise of the Scientific Revolution. Protestantism also has had an important influence on science. According to the Merton Thesis, there was a positive correlation between the rise of English Puritanism and German Pietism on the one hand, and early experimental science on the other. The cultural influence of Christianity includes social welfare, founding hospitals, economics (as the Protestant work ethic), natural law (which would later influence the creation of international law), politics, architecture, literature, personal hygiene (ablution), and family life. Historically, extended families were the basic family unit in the Christian culture and countries. Christianity played a role in ending practices common among pagan societies, such as human sacrifice, slavery, infanticide and polygamy. Scientists such as Newton and Galileo believed that God would be better understood if God's creation was better