Why did Marcus Vipscnius build the Pantheon?

Answer 1

The building was built to worship their gods, for more information

please go to http://www.historyforkids.org/learn/romans/architecture/pantheon.htm

Its in simple form. The emperor Hadrian actually had the Pantheon rebuilt. The engineers of his time did a remarkable job in the rebuilding. It happens to be the best preserved building in the ancient world.

The original Pantheon was rectangular and had been destroyed by fire. Hadrian had his architects raise a circular dome. Perhaps only the dome of St.Peter's and the Capitol dome in Washington DC can be said to surpass it. Most remarkable based on the approximate time of its construction somewhere in the early 2nd century AD CE.

Some ancient historians put forth the idea that the coffered dome rising inward from the top of the walls was a triumph in Roman engineering.

Answer 2

Um, his name was Marcus Vipsanius Agrippa, better known as Marcus Agrippa, or simply Agrippa. He built the original pantheon as an honor to all the gods and as an honor to Augustus. It is said there were statues of both Augustus and himself at the entrance way of the original building.