premise: Vatican City is a colony.
hypothesis: Vatican City ( [ ˈvætᵻkən_ˈsɪti ] Città del Vaticano [ tʃitˈta ddel vatiˈkaːno ] Civitas Vaticana ) , officially Vatican City State or the State of Vatican City ( [ Stato della Città del Vaticano , links = no ] [ Status Civitatis Vaticanae , links = no ] ) , is a walled enclave within the city of Rome .