Samuel Pepys

The man who wrote down everything — and gave us the best window into 17th-century London.

The basics

Samuel Pepys (1633–1703, pronounced “Peeps”) was a naval administrator, Member of Parliament, and president of the Royal Society. He is famous for his diary, kept from 1660 to 1669, which provides the most vivid surviving account of Restoration London — including eyewitness descriptions of the coronation of Charles II, the Great Plague, and the Great Fire of London.

The diary

Pepys wrote in a form of shorthand (Thomas Shelton’s system) that wasn’t decoded until 1825. The diary is extraordinary because Pepys recorded everything with equal candor: affairs of state, scientific experiments, domestic arguments, sexual adventures (often in a macaronic mix of languages to obscure the details), meals, plays, and the price of cheese. His entry for September 2, 1666 (the start of the Great Fire) is one of the great pieces of reportage in the English language. He buried his wine and his Parmesan in the garden to save them from the flames.

Naval career

Pepys’s day job was running the Royal Navy’s bureaucracy. As Clerk of the Acts and later Secretary to the Admiralty, he modernized naval administration — introducing systematic record-keeping, merit-based promotion, and professional examinations for officers. This was unglamorous work that mattered enormously: the navy that would defeat France and build the British Empire was partly Pepys’s creation.

The Royal Society

Pepys was elected president of the Royal Society in 1684. His name appears on the title page of Newton’s Principia Mathematica (1687) as the Society’s president who authorized its publication — though Pepys himself admitted he couldn’t understand the mathematics. He called Robert Hooke’s Micrographia “the most ingenious book that ever I read in my life.”

In the novel

Pepys appears as a social connector — the kind of man who knows everyone, attends everything, and keeps track of all the gossip. His presence at Royal Society meetings and in London’s coffeehouses makes him a natural point of contact for Daniel Waterhouse. Stephenson uses Pepys the way the historical record uses the diary: as a lens through which to see the period’s texture and detail.