Holy orders
He is not, however, out of consideration for the public welfare, to exercise this power personally, unless in very exceptional cases, where certain specific impediments are in question. Such cases are error, violence, Holy orders, disparity of worship, public conjugicide, consanguinity in the direct line or in the first degree (equal) of the collateral Line and the first degree of affinity (from lawful intercourse) in the direct line. As a rule the pope exercises his power of dispensation through the Roman Congregations and Tribunals.