Aeque principaliter
Jus novum c. 1140-1563
Jus novissimum c. 1563-1918
Jus codicis 1918-present
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Aeque principaliter "equally important" is a Latin term used by the Roman Catholic Church to indicate a merger of two or more dioceses in which – to avoid questions of controls – the dioceses are all given equal importance. such a merger often followed a merger in persona episcopi.