Who is known as the first planner and developed the concept of the Gridiron?

The individual recognized as the first planner and credited with the development of the Gridiron concept is Hippodamus of Miletus. He was an ancient Greek architect and urban planner who lived in the 5th century BCE. Hippodamus is particularly notable for his systematic approach to city planning, where he utilized a grid layout, arranging streets in a rectangular pattern. This allowed for better organization and accessibility in urban areas, influencing future city planning concepts.

His method involved dividing cities into blocks, which included residential, public, and religious spaces, effectively creating a functional and aesthetically pleasing environment. This gridiron layout not only facilitated movement within the city but also served as a model for subsequent urban planning efforts across various cultures and time periods, demonstrating a significant advancement in the development of urban environments.

In contrast, the other figures mentioned are prominent in philosophy and political theory but are not directly associated with the foundational work of urban planning or the specific concept of the Gridiron. Therefore, focusing on Hippodamus's contributions provides clarity on his pioneering role in planning history.