Why did the worship of Serapis appeal to both Greeks and Egyptians?

The worship of Serapis appealed to both Greeks and Egyptians because he was intentionally crafted as a bridge between their distinct religious traditions.

Ptolemy I Soter introduced Serapis as an official deity to unify his subjects in Alexandria by blending Egyptian and Hellenic elements. For the Egyptians, the god was rooted in the ancient cult of the sacred Apis bull, which was associated with Osiris after death as Osorapis. By adopting and refining this figure, the Ptolemaic dynasty maintained a connection to traditional Egyptian religious practices.12

For the Greeks, Serapis was reimagined with Hellenic characteristics. His iconography—a robed, bearded figure—resembled that of Zeus, and his cult incorporated Greek rituals. As he evolved, Serapis gained broad appeal as a deity of the Sun, healing, and fertility, allowing him to function as a universal godhead that resonated with the diverse populations of the Roman Empire and the wider Mediterranean.12