The Council of Blachernae was a church council in the Byzantine Empire, convened in May 1157 at the imperial Palace of Blachernae, which condemned the newly elected Patriarch of Antioch Soterichos Panteugenos, and the rhetoricians Michael of Thessalonica and Nikephoros Basilakes.
In Panteugenos' view, humanity thereby exchanged substance by physically incorporating the Son, and became a sort of partner to God the Father.
[2] The case was heard before an assembly of senior courtiers and clergy.
After Michael and Basilakes recanted, Panteugenos stubbornly defended his views even against the Emperor, until he too was persuaded to confess to error.
[3] After that, the most senior of the prelates present, including the patriarchs of Constantinople and Jerusalem, and the Archbishop of Bulgaria, demanded his dismissal, which was announced the next day.