Who is recognized as the author of the world's oldest research on architecture?

The recognition of Vitruvius as the author of the world's oldest research on architecture stems from his influential work "De Architectura" (On Architecture), written in the 1st century BCE. This substantial ten-book treatise is the only surviving work from antiquity that provides a comprehensive overview of classical architecture and engineering principles. Vitruvius's writings cover a wide range of topics, including building materials, urban planning, and the relationship between architecture and nature.

His emphasis on the concepts of firmness, commodity, and delight as the three fundamental qualities of architecture has had a lasting impact on architectural theory. In addition, Vitruvius's detailed descriptions of structures and his insights into practical building methods have made him a pivotal figure in the history of architecture. His work not only laid the foundational principles for future architects and builders but also served as a reference for the Renaissance and modern architecture, demonstrating his enduring influence on the field.