instruction:
In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
question:
Context: Karel Bossart was born on February 9, 1904 in Antwerp, Belgium. Link Information: The earliest mention of Antwerp dates from the 4th century.

In the 4th century Answer: 17
answer:
How old is the city where Bossart was born?


question:
Context: the last Bulgarian Tsar Ivan Shishman Link Information: 

Ivan Shishman () ruled as emperor (tsar) of Bulgaria in Tarnovo from 1371 to 3 June 1395. Answer: 24
answer:
How long did the last Bulgarian Tsar rule the Empire?


question:
Context: Antes also built a gristmill and his fortified home, Fort Antes, provided a safe haven for the early settlers against raids conducted by Loyalist and Indian forces during the American Revolution. Link Information: Fort Antes was a stockade surrounding the home of Colonel John Henry Antes, built circa 1778 Answer: 1778
answer:

What year did John Henry Antes complete the building of his home?