‘in quarto & quarto consanguinitas’: more on consanguinity

Here is the marriage record for Jeremiah McCarthy and Honora Donovan, who married on 5 February 1823.

McCarthy-Donovan marriage record
Marriage of Jeremiah McCarthy and Honora Donovan, 5 February 1823. Durris (Muintervara), Cork & Ross, Irish Genealogy.ie.

Witnesses to the marriage were Patrick Donovan and Richard Tobin; and the priest, the Rev. Richard Quinn, noted that a dispensation ‘in quarto & [et] quarto consanguinitas’ (of the fourth to the fourth degree of consanguinity) had been obtained.

both bride and groom were removed by four degrees from a common ancestor

Basically, this indicates that both bride and groom were removed by four degrees from a common ancestor (directly descended from the same 2x great-grandparent, in other words), which would make them third cousins.

Earlier discussion of consanguinity and marital dispensations found here.