Take the following as truth: Linked to the Vatican by a thick-walled passage, it served as a hideout for popes in times of danger, notably Pope Clement VII, who holed up here for a month during the sack of Rome by Habsburg troops in 1527 .
Then the following statement: "The passage which connects it to the Vatican was added in the 14th century." is true, false, or inconclusive?
Answer: Inconclusive