[Modus vacandi beneficiorum]

When one holds a benefice for years without a dispensation, that benefice becomes vacant de facto.
¶ Item, a benefice becomes vacant if someone, while established in infirmity, should resign any benefice, wheresoever it may be, in the Roman Curia or outside it; if he dies within twenty days, then the resigned benefice becomes vacant by death and not by resignation, and they are reserved to the Apostolic See.
¶ Item, through the irregularity of homicide, such as not taking care to carry out apostolic mandates.
¶ Item, whoever has remained in excommunication for a year, his benefice becomes vacant; similarly for him who celebrates before an excommunicate or knowingly in an interdicted place.
¶ Item, benefices with care [of souls], including dignities and personates, also become vacant through the constitution Execrabilis of holy memory, Pope John XXII, in this manner, namely: if someone holds one benefice with care, or a dignity, or a personate, and retains the first with a second for a month without a dispensation, then both become vacant, and he loses both the first and the second, and...