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What did Apollinaris the Younger teach about the humanity of Jesus?

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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.

Apollinaris the Younger taught that Jesus Christ possessed a divine nature—specifically the divine Logos—housed within a human body, but he denied that Christ possessed a rational human soul.12

In this view, known as Apollinarianism, the divine Logos took the place of the human mind or soul that would ordinarily govern a person. Apollinaris developed this position as a reaction against Arianism, attempting to emphasize the divinity of Christ. However, the church ultimately rejected this teaching, as it was deemed insufficient to describe Christ as fully God and fully human. The First Council of Constantinople in 381 formally condemned Apollinarianism, affirming the orthodox doctrine that Christ is both true God and true man, possessing both a divine nature and a complete human nature, including a rational soul.312