Abstract
The principle of least time was first conceived by mathematicians-physicists, such as Ibn al-Haytham (Alhazen), as the principle of the easiest way followed by the light ray. It was not until the invention of the maximum and minimum method by Pierre de Fermat that this principle, stated in the Book of Optics of Ibn al-Haytham, became the principle of least time. This article examines the history of this principle in ancient and classical optics.
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