No matter how much free time you have this weekend, we have TV recommendations for you. Come back every week for new suggestions on what to watch.

This Weekend I Have … an Hour, and Happy Valentine’s Day

‘A Very British Romance With Lucy Worsley’

When to watch: Sunday at 8 p.m., on PBS. (Check local listings.)

The flowers, the cards, the professing of feelings — blame England, whence these traditions came. Lucy Worsley traces the history of romance, which on this week’s episode includes medieval chivalry but also love letters between average Victorian-era folks, the apparent codes with bouquets and the sublimated sexiness of séances. It’s not all lovey-dovey, either; one lost tradition is that of a “vinegar Valentine,” which was a mean card you sent to someone you didn’t like. Take that, subtweets.