Humanist who was born in Diest in 1493. After studying at the Drietalen College in Leuven, he wrote a greek grammar, which was still being reprinted in the 18th century. Cleynaerts was the first Fleming ever to make a thorough-going study of Islam. He spoke excellent Arabic and read the Koran so well that even Muslims were amazed by his knowledge. He died in Granada in 1542.