Throughout the Dark Ages Christians believed in a geocentric universe and such was taught as official Church doctrine, as seen in Dante's works, yet this view had come from a Greek (a pagan) who lived a long time ago. Name the Greek.

I think you're asking for the ancient Greek who believed we have a heliocentric universe. Check this site in the ancient Greco-Roman World section.

http://en.wikipedia.org/wiki/Heliocentrism

It was not until the times of Copernicus that heliocentrism was mathematically proven, of course. Although it was an interesting suggestion from the Greeks.

The Greek philosopher who is responsible for the geocentric view of the universe is Claudius Ptolemy. To arrive at this answer, one must understand the historical context and the contributions of Ptolemy to astronomy.

To explain further, during the Dark Ages, the prevailing belief in Europe was that the Earth was at the center of the universe, with all other celestial bodies orbiting around it. This concept is known as geocentrism. This view was strongly supported by the Christian Church and considered to be official doctrine.

However, the origin of this belief can be traced back to ancient Greece. Claudius Ptolemy, an astronomer, mathematician, and geographer who lived around the 2nd century AD, developed a comprehensive geocentric model of the universe. His work titled "Almagest" described a system where the Earth was stationary at the center, with planets, stars, and the Sun revolving around it in specific orbits.

Ptolemy's geocentric model gained widespread acceptance in the ancient world and continued to be influential throughout the Middle Ages. It was incorporated into medieval Christian theology and became an integral part of Dante's works, such as "The Divine Comedy."

In summary, the Greek philosopher who introduced the geocentric view of the universe, which later became official Church doctrine during the Dark Ages, was Claudius Ptolemy. This answer was obtained by understanding the historical context and the contributions of Ptolemy to astronomy.