Filioque
Nicene Creed
The Nicene Creed as amended by the Second Ecumenical Council held in Constantinople in 381 includes the section:
Fourth Ecumenical Council
[ ] no one shall [ ] bring forward a different faith [ ], nor to write, nor to put together, nor to excogitate, nor to teach it to others. [Those who] either [ ] put together another faith, or [ ] bring forward or [ ] teach or [ ] deliver a different Creed [ ] to [those who] wish to be converted [ ] from the Gentiles, or Jews or any heresy whatever, if they be Bishops or clerics let them be deposed, [ ] but if they be monks or laics: let them be anathematized. [ ]
Procession of the Holy Spirit
However, while the doctrine was taught in Rome, the term was not professed liturgically in the Creed until 1014.