[1] He arrived in England in 1681 as a diplomat and served as secretary to his uncle, Johan Barckman (Hans Barikman) Leijonberg, the Swedish resident in London at that time.
[16] Bancks, Rooke and some others belonged to a gentleman's club, for which commemorative medals were struck in 1703 by the visiting Swedish medallist, Bengt Richter; another member who was an M.P.
[18] He had been assaulted at Windsor Castle in July 1703, by Bancks in particular, on the occasion of Colepeper's delivering a petition for Daniel Defoe who was imprisoned.
[24] It was provoked by an address the year before by Bancks to the borough, commending the doctrine of passive obedience over Whig resistance theory.
[15][26] Bancks was implicated in the "Gyllenberg Plot", a Jacobite conspiracy in 1716–7 set up by Carl Gyllenborg and Georg Heinrich von Görtz.
[27][28] He was taken into custody, with Charles Caesar, on 29 January 1717, the day on which General George Wade implicated Gyllenborg in plotting by finding incriminating papers.
[34] When the younger Jacob Bancks died intestate, a complex lawsuit arose, involving the Swedish side of the family.