- Henry Arlanc, Huguenot, friend of Jack Shaftoe, porter at the Royal Society
- Mrs. Arlanc, wife of Henry
- Roger Comstock, Marquis of Ravenscar, Whig ally of Daniel Waterhouse
- Will Comstock, Earl of Lostwithiel
- Édouard de Gex, Jesuit fanatic
- William Ham, banker, nephew of Daniel Waterhouse
- Otto van Hoek, Captain of the Minerva
- Dappa, First mate of the Minerva
- Mr. Kikin, Russian diplomat in London
- Norman Orney, London shipbuilder
- Mr. Threader, Tory money-scrivener
- Charles White, Tory who bites off people's ears
- Peter Hoxton (alias Saturn), Horologist, engages in illicit activities
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