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What caused the Acacian Schism between the Eastern and Western churches?

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Christology The Transfiguration, the nature of Jesus as the Son of God being revealed to the apostles Peter, James, and John, mosaic icon, early 13th century; in the Louvre, Paris.

The Acacian Schism (484–519) was a 35-year ecclesiastical split between the patriarchate of Constantinople and the Roman see, triggered by the publication of the Henotikon in 482.12

This edict, drafted by Patriarch Acacius with the support of Emperor Zeno, was an attempt to unify Chalcedonian Christians and miaphysites (who believed Christ possessed a single nature). While the Henotikon affirmed Christ's divinity, it intentionally omitted the doctrine of Christ’s two natures—human and divine—as established by the Council of Chalcedon in 451.13

Because the Henotikon appeared to favor Monophysitism, a doctrine previously condemned by the church, Pope Felix III deemed it inadmissible. In 484, the Pope excommunicated Acacius, an action that was later extended to include much of the Byzantine hierarchy, thereby formalizing the schism. The division persisted until 519, highlighting the deep tension between imperial efforts to maintain political unity and the Western church's commitment to established Christological dogma.124