In the standard Swedish biographical dictionary (Svenskt Biografiskt Lexikon) it is suggested that the Livonian nobleman Otto Arnold von Paykul (1662-1707), who was executed for serving in the enemy's forces during the GNW, may have been the son of Johann Friedrich von Paykull and Elisabeth Lode. This information is taken from Genealogisches Handbuch der baltischen Ritterschaften. Teil Estland, 1, pp 717-720. However, it appears to be incorrect, as letters from 1692 which concern him and the Koskullshof estate (LVVA, fond 7349, op. 2, vol. 217) indicate that he had inherited it from cavalry captain George Paykul (died 1688) and that his stepmother had lived there since his father's death. This corresponds well with records from the same year in Estonian Historical Archive: Otto Arend Paykell contra seine Stiefmutter geb. Anna von Wolfframsdorf in puncto Vermögens-Auseinandersetzung (EAA.915.1.249).
The LVVA fond 7349 is also enormously rich in material about Johann Reinhold Patkul (1660-1707). This is particulary true of opis 2, volumes 191-204, where one finds a lot of material both about Patkul's military service and his political activities in the first half of the 1690's. One example is a letter from Governor General Hastfehr to Governor Soop, dated 14 March 1693. Hastfehr writes that captain Patkul has complained to him about being sent to Kokenhusen. Patkul has indicated that this would cause him so much trouble that he would feel forced to ask for a discharge. But as Charles XI now had decided to remove Patkul not only from Hastfehr's regiment but also from Livonia and place him in Finland (as captain in the Åbo infantry regiment). So, Hastfehr writes, this had taken the matter entirely out of his own hands. If Patkul still wanted to resign he should request his discharge through the proper channels (LVVA, fond 7349, op. 2, vol. 217, pp. 62-63)