Lamassu is a half lion and half bull monster in Assyrian and Babylonian mythology, guarding Assyrian temples and palaces. They have wings, can fly, and have great power.
Ramasu has a robust body of wild beasts, but also has a human head and face, as well as Assyrian hair and hats, and huge wings flapping behind him.

Ramasu is a half lion and half bull monster in Assyrian and Babylonian mythology, guarding Assyrian temples and palaces. They have wings, can fly, and have great power. Correspondingly, Shedu, also a winged monster with a human head and a cow body, along with Ramasu, defended the temples and palaces of the Assyrians.
The combination of different animals or between animals and humans is a common theme in ancient mythology and art, such as the "centaur" in ancient Greece or the "Camara" in Etrusia. "Ramasu" is no exception. It has the robust body of a wild beast, but also has a human head and face, as well as Assyrian hair and hat. Behind it, there are huge wings flapping. Compared to the wildness and impulsiveness represented by the centaur, the Ramasu are more rational, powerful, and imperial. They are the guardians of palaces, the guardians of Assyrians, the wise humans, the ubiquitous birds, the majestic lions and bulls, reflecting the powerful power of Assyrian monarchy.

"Ramasu" is a creation of the Assyrians, with the basic form of a human head, lion body, and winged statue integrated with the wall. It is known as "Ramasu" in Assyrian culture. Ramasu, as an outstanding representative of architectural decorative sculpture, is widely found in the palaces of Assyrian kings. As a type rather than a piece of art, "Lamasu" has diverse locations, some of which are located at the entrance of the city gate.
When the foreign envoy meets the Assyrian king, at the moment he steps through the gate, he is first enveloped and embraced by these two giant beasts that are over four meters tall, involuntarily trembling in the magical gaze of the beasts. This can be seen as psychological tactics from 2700 years ago.
Sagon II Castle is located in a castle enclosed by a wall, which was built around the same time and has a total length of approximately 1.6 kilometers. The main building material is mud bricks, but the perimeter of the wall base is covered with thick stone slabs, called orthostats, which is a characteristic of Assyrian architecture. The unique system of Assyrian palaces emerged in the 13th century BC, with courtyards and rows of rooms arranged diagonally instead of axially, so the connection between one space and another is not on the axis. The first large atrium is nearly 90 meters square, with a door leading to the corner of the second rectangular courtyard. On the longer side, there is a room for placing the throne. Its symmetry can be seen in the designs of various units, with the most prominent being the grand entrance. At the entrance, there is a sculpture shaped like a large bull with a human head and wings called lamasu, which is believed to be a guardian deity that can drive away evil spirits.

The walls of Sagon II's castle not only feature large-scale narrative relief art, but also the "Lamassu" at the entrance of the palace, also known as the "double winged divine beast with a human face and a cow body," which is one of the masterpieces of Assyrian relief art. People believe that it is a guardian god that can drive away evil spirits. It guards every entrance, and all foreign envoys, nobles, and petitioners must pass through it before entering the room where the throne is placed. Similar Ramasu stone carvings also guard the entrances to other palaces. Although its appearance is large and intimidating, it has finely crafted details: curled beards, feathers on eagle wings, muscles and blood vessels on legs, making it an unforgettable example of architectural sculpture. The earliest Lamasu appeared in Nemrud, dating back to the early 9th century BC, with some of their bodies being lions rather than bulls. Nevertheless, some Assyrian Ramasu still have characteristics that are not found in other Ramasu regions. That is to say, when viewed from the front, they are upright and motionless, but when viewed from the side, they move slowly forward. From a special angle, it can be seen that they have five legs. Obviously, they should be seen as two reliefs connected together at certain correct angles, rather than viewed from a comprehensive perspective. Most Assyrian relief art works are based on the military expeditions of the monarch, and are presented horizontally on stone slabs, displaying a large number of images of characters, horses, and tanks. It is good at expressing narrative and solemn images, and it spread to the Mediterranean region with the expansion of the empire, which naturally had some influence on the artistic style of the Mediterranean region later on.