Athanasius III served as Greek Patriarch of Alexandria between 1276 and 1308.
Athanasius, then ill with gout, attended the Council of Blachernae in 1285 which repudiated the attempted union at Lyons.
[1] However, that council did not place the Latins under formal anathema, and this may have been due to the influence of Athanasius.
According to Kenneth M. Setton, "Athanasius III of Alexandria was also in communion with Rome at the time of his death in 1308 at the hands of the Moslems.
"[2] Since Pope Innocent III appointed a titular Latin Patriarch of Alexandria in 1310, it is likely that ecclesiastical communion with Rome had been broken shortly after the Athanasius III episcopate.