Guido di Montanor was a Greek or French alchemist who lived in the 15th century.
His work, such as the Scala Philosophorum, is referenced in quotations and extracts in subsequent sources.
He integrated the different settings of Ramon Llull and Arnaldo on one side, and Paolo of Taranto on the other.
His main work was the Scala philosophorum, meaning "Scale of the Philosophers".
This work was one of the first known to present a systematic order and structure for alchemic processes.