The first reference to the flowers forget-me-not in England came from Henry IV, who adopted it in his exile, and brought it back.
In late antiquity, Alexandria had about one temple for every twenty houses.
New England meeting houses were open to any honorable gathering, secular or religious in nature. Nevertheless, that was where the services were held on Sundays, and with the difficulties of travel, the site of the meeting house was important to everyone in the town. When the town of Stonington Connecticut managed to agree amiably on the site, without appeal to an higher state authority, they named the location "Agreement Hill" to commemorate it. Then, of course, you had to "dignify the congregation" with assigning pews, the better to the better sort of person, the worse to the worse, a question regarded as among the gravest. (There are very few original meetings houses surviving, because they updated them to keep in the fashion, for painting or bells for instance. The few Anglican churches were less prone to this, because they were regarded as sacred space.)
The careful determination of lucky and unlucky days in the Roman calendar was of utmost political importance.
Bookmarks appear to have been invented about the same time as the codex format, but the oldest extent one is from the 6th century.
A Roman wet nurse was the only person not related to the child allowed to register a complaint about the untrustworthiness of his guardian. She was also the only slave a slave-owner under twenty could manumit.
In the Ozarks, where musical instruments were considered wicked -- you could play a game to a song as long as it was sung, but an instrument made it a dance and wicked -- fiddles were considered particularly evil and instruments of the Devil.
There were legends that Nero would return after his death. Several pretenders tried to make themselves emperors pretending to be him. And the legend last from the first century to the fifth.
Johann Fust, early printer (having sued Gutenberg and gotten his hands on the press), was accused of witchcraft. It was the uncanny way that all the letters in the different books were exactly alike.
When Octavien Caesar returned from Egypt to a triumph, the amount of loot thus injected into the Roman economy made interest rates fall and land prices jump.