15th century

A samurai sword dating from the 15th century was among the artefacts abandoned by the departing inhabitants of the former Earth colony Jegg-Sau in the 25th century. (AUDIO: The Relics of Jegg-Sau)

The First Doctor, Susan Foreman, Ian Chesterton, and Barbara Wright visited the Aztec empire. Barbara, taken for the reincarnation of Yetaxa, tried in vain to stop the Aztec practice of human sacrifice. (TV: The Aztecs)

By the 15th century, it was against Spanish custom to engage in the slave trade. (AUDIO: Trouble in Paradise)

It was also among the centuries endured by Ashildr, (TV: The Woman Who Lived) 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)