poet and Sufi (Muslim mystic), an early Turkish mystic leader who exerted a powerful influence on the development of mystical orders throughout the Turkish-speaking world.

Very little is known about his life, but legends indicate that his father died when the boy was young and his family moved to Yasī, where he began his mystical teaching, hence his name. He is said to have gone to Bukhara to study with the great Sufi leader Yūsuf Hamadhānī and other famous mystics. Finally he returned to Yasī. The extant work attributed to the poet is the Divan-i hikmet (“Book of Wisdom”), containing poems on mystical themes. Scholars believe that the work is probably not his. It is felt, however, that the poems in the Divan are similar in style and sentiment to what he wrote. The importance of Ahmed Yesevi cannot be overestimated. Legends about his life were spread throughout the Turkish Islamic world, and he developed a tremendous following. The conqueror Timur erected a magnificent mausoleum over his grave in 1397/98, to which pilgrims came, revering Ahmed Yesevi as a saint.

Ahmed Yesevi wrote poetry for the people, and his mystical order was a popular brotherhood. Not only Islamic but also ancient Turco-Mongol practices and customs were preserved in their ritual. His disciples formed many affiliated mystical associations that spread throughout the Turkish world. His poetry influenced Turkish literature a great deal, paving the way for the development of mystical folk literature.