18th century

The 18th century was notable for the emergence of the first modern democracies in the United Kingdom, America, and France. (TV: The Reign of Terror) It also marked the beginning of the Industrial Revolution, which may have been inspired by Azal. (TV: The Dæmons)

During this century, Weed creatures were first seen along the North Sea coast. (TV: Fury from the Deep)

The Doctor ran Taunton for two weeks and complained that he'd never been so bored. (PROSE: The Highest Science)

The Doctor learned to cook in Paris. (TV: The Lodger)

Cuthbert Simpson was sent by the Time Lords to Banquo Manor. (PROSE: The Banquo Legacy)

It was also among the centuries endured by Ashildr, a 9th century Viking girl who was rendered effectively immortal when she was brought back to life by the Twelfth Doctor through a self-repairing Mire repair kit. (TV: The Girl Who Died)