Aut simul stabunt aut simul cadent

The Latin brocard aut simul stabunt aut simul cadent (or simul simul for short), meaning they will either stand together, or fall together, is used in law to express those cases in which the end of a certain situation automatically brings upon the end of another one, and vice versa.

The first use of this expression in the mass media, which made it known to the non-specialists, was in occasion of one of the first crises between fascist Italy and the Vatican concerning the Concordat. Pope Pius XI is believed to have pronounced the sentence to express the fact that challenging the Concordat would have swept away the whole Lateran treaty, reopening the Roman question.

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