Final answer:
In Sigmund Freud's view, the role of the ego is to mediate among the id, superego, and reality.
Step-by-step explanation:
The role of the ego, according to Sigmund Freud, is to mediate among the id, superego, and reality. The ego acts as the rational part of our personality and helps balance the demands of the id and superego in the context of reality. It operates on what Freud described as the 'reality principle.'