Final answer:
The Lamassu from the Citadel of Sargon II is primarily made of gypseous alabaster and symbolizes the power of the Assyrian king while guarding the palace gates.
Step-by-step explanation:
The Lamassu from the Citadel of Sargon II, which dates back to the Assyrian period around 720 - 705 BCE, is primarily made of gypseous alabaster. These impressive sculptures served as guardian figures for the palace entrance and were known for their combination of a human head, the body of a bull or lion, and massive wings. These figures are significant in that they symbolize the power of the Assyrian king and provided a protective and fearsome presence at the gates of the citadel, which consisted of a royal palace and temple.