It's important to understand that the idea of a flat Earth is not a historical claim from any reputable scientific or intellectual figure. While there were some ancient civilizations who believed in a flat Earth, there's no single person who can be credited with claiming it.

Here's a breakdown:

* Ancient Civilizations: Some ancient cultures, like the Babylonians and Egyptians, did believe in a flat Earth model. However, these ideas were based on limited observation and lack of sophisticated tools for studying the Earth.

* Modern Flat Earthers: The modern "flat Earth" belief is a fringe theory with no scientific evidence to support it. There are individuals and groups who promote these ideas, but their claims are widely rejected by the scientific community.

It's crucial to remember that the idea of a flat Earth is not a serious scientific theory. The overwhelming evidence from multiple fields, including astronomy, geography, and physics, confirms that the Earth is an oblate spheroid (slightly flattened at the poles).