This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.

Passage: When the British invaded the harbour town in 1744[verification needed], the town's architectural buildings were destroyed[verification needed]. Subsequently, new structures were built in the town around the harbour area[verification needed] and the Swedes had also further added to the architectural beauty of the town in 1785 with more buildings, when they had occupied the town. Earlier to their occupation, the port was known as "Carenage". The Swedes renamed it as Gustavia in honour of their king Gustav III. It was then their prime trading center. The port maintained a neutral stance since the Caribbean war was on in the 18th century. They used it as trading post of contraband and the city of Gustavia prospered but this prosperity was short lived.
In what year was Carenage established?