Cosimo Malaspina was a famous mage and the teacher of Alzur. According to Ortolan, Malaspina and Alzur were the creators of witchers.
This article is too short to provide more than rudimentary information about the subject. You can help Witcher Wiki by expanding it.
Malaspina is mentioned as Malaspin in the Laboratory notebook by Ireneus var Steingard, who cruelly experimented on the witcher Kiyan and compared himself to creators of the witchers.