Menesius came from an old wealthy Scottish family of Catholic and traditional background from
Aberdeen, who were forced by religious persecution to immigrate to France in 1639. Menesius studied at the
Douai College. After
Oliver Cromwell's death in 1658 the family returned to Scotland when
Charles II returned the family's land. However, their wealth was lost and Paul, the youngest son, had to seek his own living. He joined the
Polish army. In 1660, he defected to Russia. There, he received a master's rank and later married the daughter of a Dutchman by the name of Peter Marselis who was also in the service of Moscow. Menzies' friendship with
Kirill Naryshkin, who since 1671 was the Tsar's father-in-law, and Patrick Gordon and others placed him close to Tsar Alexei. When in 1671 - 1672 during a return to Scotland, his fortunes took a further turn. The Russian state was looking for allies among the European states to fight
Turkey. Menesius with his linguistic skills and Catholic faith was enlisted as an ambassador and sent in 1672, to
Berlin,
Dresden,
Vienna,
Venice and
Rome. Although he was welcomed, he did not receive any direct response to the appeal for alliance. However, despite Austrian suspicion; in Vienna when he announced that the Turks had conquered the
Kamenets and Russian arsenals, the Austrian Emperor led an army to the borders to defeat the infidel invader. ==Meeting with the pope==