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Galileo did not propose a heliocentric theory, he agreed with Copernicus and his heliocentric theory. The Catholic church, at the time, disagreed and they held a huge amount of power and put him on trial.
If you mean what scientist created the heliocentric theory, it was Nicolaus Copernicus. Based on astronomical observations, he determined that the Ptolemaic geocentric theory was incorrect, and replaced it with his own heliocentric theory, which placed the sun at the center of the universe, and had planets orbiting the sun.
The heliocentric theory, proposed by Nicolaus Copernicus, states that the Earth and other planets revolve around the Sun, contrary to the previously accepted geocentric model.
The heliocentric theory, proposed by Copernicus, states that the Sun is at the center of the solar system and that the planets, including Earth, orbit around it.
He was a Polish mathematician who disagreed with Ptolemy's view that the earth is the center of the universe. The heliocentric theory is the theory that the sun is the center of the universe, not the earth.