When did Ptolemy I Soter officially become king of Egypt?

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Coin depicting Ptolemy I Soter — Ptolemy I Soter Ptolemy I Soter, portrait on a silver tetradrachm; in the British Museum

Ptolemy I Soter officially assumed the title of king in 305 BCE.12

Prior to this, he served as the satrap of Egypt following the death of Alexander the Great in 323 BCE. While he had exercised significant authority and demonstrated self-confidence in his role as satrap—such as through the inscription of the Satrap stela in 311 BCE—he did not formally adopt the royal title until 305 BCE, following the example of other successors who declared themselves kings after the naval battle near Salamis.312