Leonardo da Vinci was ambidextrous and could write with one hand while
drawing with the other.

Famous artist Leonardo da Vinci was ambidextrous, and could write with one
hand while drawing with the other. Not only could the Italian Renaissance
artist write with both hands simultaneously, da Vinci had taught himself
mirror writing: only when a written text is held to a mirror can it be
read. Much of da Vinci's journals and notes are written in mirror-image
cursive.