One theory is that the zodiac was created by the Babylonians, an ancient civilization that lived in Mesopotamia (modern-day Iraq). The Babylonians were skilled astronomers, and they are credited with developing the first system of astrology. It is possible that the Babylonians also created the zodiac signs, as a way to map out the sky and predict the movements of the stars.
Another theory is that the zodiac was created by the ancient Egyptians. The Egyptians were also skilled astronomers, and they developed their own system of astrology. It is possible that the Egyptians also created the zodiac signs, as a way to track the movements of the sun and the moon.
Still another theory is that the zodiac was created by the Greeks. The Greeks were also skilled astronomers, and they adopted the Babylonian system of astrology. It is possible that the Greeks also adopted the zodiac signs, as a way to map out the sky and predict the future.
Ultimately, the true origins of the zodiac remain a mystery. However, the theories discussed above provide some possible explanations for who may have written the zodiac signs.