Who is John the Scot from A History of Western Philosophy and what is their importance?

John the Scot was born about 800 and died in 877. He was an Irishman and a Neoplatonist. He was a Greek scholar, a Pelagian, and a pantheist. His patron was Charles the Bald, king of France, who invited him about 843 and made him the head of the court school. He wrote a treatise On Divine Predestination, where he expressed his views in support of archbishop of Rheims, Hincmar.