The Primitive Scottish Rite is a Masonic Rite. According to Robert Ambelain, an esotericist who "awakened" it in 1985, it was the rite used by the St. John of Scotland Lodge in Marseille, which was introduced to France in Saint-Germain-en-Laye from 1688; these claims are disputed by historians.
According to Robert Ambelain, the Primitive Scottish Rite was practiced by the military Jacobite Lodges, founded by exiled Scottish and Irish Jacobite followers of the deposed Stuart King, James II of England (James VII of Scotland). The Lodges' soldiers were widely numbered enough in 1725 to form a "Very Old and Honorable Society of Freemasons in the Kingdom of France." Their rituals were introduced to Marseille in 1751 by Georges de Wallnon (or Waldon), founder of the Lodge Saint Jean d'Écosse de Marseille. They would also greatly inspire the rite of the Rite of Strict Observance and Scottish Rectified Rite. The motto of the Primitive Scottish Rite is "Primigenius More Majorem." This is the lineage claimed for the current, "Awakened," Primitive Scottish Rite by Robert Ambelain in 1985.
The term "Primitive Scottish Rite," or "Early Grand Scottish Rite", appeared very late in the nineteenth century in a book entitled "The Rituals of the Degrees of the Early Grand Scottish Rite," published in 1890 by Matthew McBlain. These rituals are actually the first compilation of rituals of the standard Rite of the Grand Lodge of Scotland, and have nothing to do with the Primitive Scottish Rite that emerged in the twentieth century, either in source or form.
It was only in 1777, when ordered to integrate into the Grand Orient de France, that the Lodge "the Perfect Equality" of Saint-Germain-en-Laye recalled its creation in 1688 by the "Royal Irish Regiment" arriving in France following the exile of James II and VII Stuart. Historians believe this claim to be probable, but have not recovered any ritual from this early period.