I found this to be strange, if not absurd:
Morteza Khalaj Amirhosseini, the author of the book "Leonardo Da Vinci's Drawings", went on to say that the book presents a complete biography of Da Vinci in which he has proved based on first-hand sources that the Renaissance artist had become a Muslim. However, the west prefers to keep silent on the subject, he added.
He added: "A French writer in the 19th century has evaluated the issue of Da Vinci's conversion to Islam in a treatise, but the west has banned the publication of this treatise."
I'm skeptical of the claim for many reasons.
Is there such a treatise? Is any verifiable evidence contained therein? Are there first-hand sources that claim that Leonardo converted to Islam, or other documents on the matter?