Remarque :
Letter sent by Innocent III to the Patriarch of Constantinople, John X Kamateros, in response to a letter by the latter [Reg. II/199 (208)]. The pope defends the Primacy of the Roman See and invites the patriarch and the Greek clergy to a Church Council.
PL 214, col. 758
This letter is also included in the Gesta Innocentii III, cap. LXI
Letter written in response to a letter by Patriarch John Kamateros: ed. by Papadakis & Talbot, Byzantinoslavica 33 (1972), pp. 33-35. The patriarch responded in turn with another letter, ibid., 35-41.
The first patriarchal letter is preserved in Latin translation in the papal registers: no. II/199 (208), Hageneder pp. 379-382.