Saint Guinefort was a dog who lived in France in the 13th century, worshipped through history as a saint until less than a century ago. The recurrence is soon, on the 22th of August.
Many think middle ages were about superstition, and generally a bad period. Black Death, COVID, and Why We Keep Telling the Myth of a Renaissance Golden Age and Bad Middle Ages tells a different, fascinating story.
Another fascinating middle age story is that of Christine de Pizan, author of The Book of the City of Ladies. This is a very good lecture about her (in Italian): Come pensava una donna nel Medioevo? 2 - Christine de Pizan. You can read some of her books at the Memory of the World library.
Still from around the middle ages, we get playing cards: see Playing Cards Around the World and Through the Ages.
If you want to go have a look in person, and you overshoot with your time machine, here's a convenient route planner for antique Roman roads.