On 17 August 1701 a Polish messenger arrived in the Swedish headquarters at Bixten (today Biksti in Latvia). Gustaf Adlerfelt calls him "the starosta Potocki, a son of the Crown Hetman" and states that he came on behalf of Cardinal Radziejowski, who wanted to tell Charles XII that it was not a very good idea to insist upon the removal of King Augustus. The Poles did not like this at all, according to Radziejowski. If Charles however would drop this proposal the Cardinal and the Republic would be ready to work for peace and were prepared to offer satisfaction.
Later historians have had very little to add. Carl von Rosen in 1935 simply followed Nordberg (whose account is very similar to Adlerfelt's) and Gustaf Jonasson did the same in 1960. According to Jonasson the starosta was called Józef Potocki, a name he likely got from Nordberg's index.
The Grand Crown Hetman in 1701 was Stanisław Jan Jabłonowski, so the messenger was rather a son of Field Hetman Feliks Kazimierz Potocki. Hetman Potocki had several sons: Michał, Józef Felicjan, Stanisław and Jerzy. Circumstantial evidence would seem to suggest that Nordberg likely got the name Józef from more famous Voivode of Kiev, later a close ally of the Swedes and that the messenger was in fact Michał, starosta of Krasnystaw since 1686 and one of the most "difficult" Polish leaders the Swedes faced during the Great Northern War. In 1702-1703 he repeatedly tricked the Swedes (most notably the cunning Magnus Stenbock), but eventually regained the favor of Charles XII and fought at Kalisz in 1706 (where his units rapidly fled). When Augustus returned to Poland in 1709 Michał Potocki left the Swedish side and then soon enough broke with Augustus again, joining Jan Grudziński's raid into Poland in 1712. A few years later he fought the Saxons as member of the Tarnogrod Confederation. When Augustus died in 1733 Michał Potocki followed the example of many of his old Swedish and Polish comrades in arms and joined Stanisław Leszczyński's side once more. Eventually unsuccessful this time as well he reconciled with the victorious Augustus III. He died in 1749 and was buried in Sędziszów Małopolski.