The period between the
death or resignation of a Pope and the election of his successor,
is formally referred to as "The Vacancy of the Apostolic See." It can also be called the Papal Interregnum, from the Latin for between thereign (of one Pope and
another). It is a period governed by papal law, which admits of no changes
to Church governance, or to the spiritual or material patrimony
of St. Peter, save the election of his successor.