St. Davids

... is a city, parish and community in Pembrokeshire, in south–west Wales. With a population of 1,841 at the 2011 census, it is Britain's smallest city in terms of both size and population.

St. Davids is the de facto ecclesiastical capital of Wales. It's the final resting place of Wales's patron saint, who was also born nearby. It was given city status in the 16th century due to the presence of St David's Cathedral; it lost it in 1888, but regained it in 1994 at the request of the Queen.

The question setter had the population as 1,797 (with no date). I don't know where this figure came from, but I can't help wondering if he or she was getting confused with the year of the most recent invasion of Britain, which happened just up the coast at Fishguard!

The Ordnance Survey includes the apostrophe in the name of the city, but the City Council leaves it out – and so does Pembrokeshire County Council's Tourism Department. Wikipedia leaves it out in the title of its page, but gives "St. David's" as an alternative spelling. You pays your money ...