experiments. The style of his commentaries and his conclusions made Philoponus unpopular with his colleagues and fellow philosophers, and he appears to have ceased his study of philosophy around 530, devoting himself to theology instead. Around 550 he wrote a theological work On the Creation of the World as a commentary on the Bible’s story of creation, using the insights of Greek philosophers and Basil of Caesarea. In this work he transfers his theory of impetus to the motion of the planets, whereas Aristotle had proposed different explanations for the motion of heavenly bodies and for earthly projectiles. Thus, Philoponus' theological work is recognized in the history of science as the first attempt at a unified theory of dynamics. Another of his major theological concerns was to argue that all material objects were brought into being by God (Arbiter, 52A–B). Around 553 Philoponus made some theological contributions to the Council of Constantinople concerning Christology. His doctrine on Christ's duality, according to which in Christ remain two united substances, united but divided, is analogous to the union of the soul and body in human beings and coincides with the miaphysite school of thought. He also produced writings on the Trinity around this time. Arbiter, John Philoponus' Christological “opus magnum” stands in the line with Cyril of Alexandria and Severus of Antioch. Philoponus asserted the understanding of Christ as divine and human, in opposition to Chalcedonian authors who strove to reach a middle ground. Legacy After his death, John Philoponus was declared to have held heretical views of the Trinity and was made anathema at the Third Council of Constantinople in 680–681. This limited the spread of his ideas in the following centuries, but in his own time and afterwards he was translated into Syriac and Arabic, and many of his works survived and were studied by the Arabs. Some of his works continued to circulate in Europe in Greek or Latin versions and influenced Bonaventure. The theory of impetus was taken up by Buridan in the 14th century. Philoponus and his contemporaries, Simplicius of Cilicia and Strato developed the Aristotelian concept of space further, eventually influencing the Renaissance theory of perspective, particularly the one highlighted by Leon Battista Alberti, and other architectural masters. Works John Philoponus wrote at least 40 works on a wide array of subjects including grammar, mathematics, physics, chemistry, and theology. On words with different meanings in virtue