The Acacian Schism and Reconciliation
The schism Anastasius inherited had divided Rome and Constantinople since 484, when Rome excommunicated Patriarch Acacius following the promulgation of the Henoticon. Anastasius judged that a measured concession might restore communion without abandoning the underlying doctrinal point. According to the sources, he was willing to accept as valid the sacraments administered by Acacius and his clergy, provided Acacius's name was removed from the liturgical diptychs, while still requiring the patriarch's formal condemnation.
His reception of Photinus, the deacon sent from Thessalonica, was taken by his opponents as a step too far toward the supporters of Acacius. The breach within the Roman church that followed was not healed in his lifetime, and the wider schism between Rome and Constantinople would not be resolved until 519. The Liber Pontificalis preserved a critical memory of his mediation, and Dante later placed a figure he identified with Anastasius among the heretics in the Inferno.