Filioque

===Adoption in the Roman Rite===

Latin liturgical use of the [[Niceno-Constantinopolitan Creed]] with the added term spread between the 8th and 11th centuries.<ref name=CCC247/>

Only in 1014, at the request of King [[Henry II of Germany]] (who was in Rome for his coronation as [[Holy Roman Emperor]] and was surprised by the different custom in force there) did [[Pope Benedict VIII]], who owed to Henry II his restoration to the papal throne after usurpation by [[Antipope Gregory VI]], have the Creed with the addition of {{lang|la|Filioque}}, sung at Mass in Rome for the first time.{{sfn|Dix|2005|pp=485–488}} In some other places {{lang|la|Filioque}} was incorporated in the Creed even later: in parts of southern Italy after the [[Council of Bari]] in 1098<ref name="Kidd2013">{{cite book|last= Kidd|first=B. J.|title= Churches of Eastern Christendom – From A.D. 451 to the Present Time|url= https://books.google.com/books?id=tc5FAAAAQBAJ&pg=PA252|year=1927|publisher= Routledge|isbn=978-1-136-21278-9|pages= 252–3}}</ref> and at Paris seemingly not even by 1240,{{sfn|Nichols|1995|p=76}} 34 years before the [[Second Council of Lyon]] defined that the Holy Spirit "proceeds eternally from the Father and from the Son, not as from two principles but from a single principle, not by two spirations but by a single spiration".{{sfn|DH|2012|loc=n. 850}}{{sfn|Tanner|1990|p=314}}

Since then the {{lang|la|Filioque}} phrase has been included in the Creed throughout the [[Latin Church]] except where [[Greek language|Greek]] is used in the liturgy.{{sfn|PCPCU|1995}}<ref>
{{cite book|year= 2005|script-title= el:Ρωμαϊκό Λειτουργικό|trans-title= Roman Missal|language= el|edition= 3rd|publisher= Συνοδική Επιτροπή για τη θεία Λατρεία|volume= 1|page= 347}} {{ISBN missing|date=November 2015}}
</ref>

Its adoption among the [[Eastern Catholic Churches]] (formerly known as Uniate churches) has been discouraged.<ref name=Brest/>{{dead link|date=April 2020}}<ref>
{{cite book
 | last1 = Manoussakis
 | first1 = John Panteleimon
 | chapter = The Procession of the Holy Spirit
 | title = For the Unity of All: Contributions to the Theological Dialogue between East and West
 | url = https://books.google.com/books?id=kwL1BgAAQBAJ
 | location = Eugene, Oregon
 | publisher = Wipf and Stock Publishers
 | date = 2015
 | page = 15
 | isbn = 9781498200431
 | access-date = 25 April 2020
 | quote = Today the ''filioque'' clause is not obligatory for the Eastern-rite Catholics, and it has been omitted from the text of the Creed by a decision of the Greek Catholic hierarchy (31 May 1973).
}}
</ref>