Given the task definition and input, reply with output. 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: Harvard was formed in 1636 by vote of the Great and General Court of the Massachusetts Bay Colony. It was initially called "New College" or "the college at New Towne". In 1638, the college became home for North America's first known printing press, carried by the ship John of London. In 1639, the college was renamed Harvard College after deceased clergyman John Harvard, who was an alumnus of the University of Cambridge. He had left the school 779 and his library of some 400 books. The charter creating the Harvard Corporation was granted in 1650.
What was the ship of John of London called?