Proteus of Egypt
Proteus was an ancient Egyptian king who was associated with the island of Pharos, his residence in Homer's Odyssey. Virgil, however, instead of Pharos, mentions the island of Carpathos, between Crete and Rhodes. This Greek island is the closest to Pharos geographically.
The name of Pharos may be a Greek adaptation of the title Pharaoh. Also, 'Proteus' may be based on one of the titles of Egyptian king, Prouti, signifying the "high doors" of the temple.
There's also some sort of association of Proteus with the island of Lemnos, close to Thrace.
Alternate story of Helen
Herodotus invoked Proteus in his telling of the story of Helen of Troy. In Book II of The History, the story is told of how Proteus rose to the throne of Egypt out of Memphis, succeeding Pheron as king. He was later succeeded by Rhampsinitus (Ramesses III, as he was known by the Egyptians). When Paris stole Helen from Sparta, winds blew him off his intended course and he found himself in Egypt. Upon their arrival, Paris and his servants discovered a temple, in which the slaves realized it would be profitable for them to take refuge. Thus, they deserted Paris, informing the authorities of his numerous wrongdoings. Word of Paris' crimes reached Proteus, who then requested Paris be brought forth for inquiry. Proteus asked Paris for the details of his journey, ultimately concluding that despite his anger and Paris' terrible actions, he cannot kill a man who is a stranger from another land. Instead of death as Paris' punishment, Proteus took Helen from Paris and seized the treasure stolen from Menelaus, intending to return both Helen and the treasure to Menelaus, to whom they were rightfully due. Proteus then urged Paris to leave Egypt.
Tragedy by Euripides
Another take on this story is presented in the tragedy Helen by Euripides. In Euripides' version, Hera had Helen taken to Egypt by Hermes, and she created a phantom replacement of Helen which Paris takes to Troy. The play takes place when Menelaus arrives at Egypt after the war. Here Proteus had safeguarded Helen throughout the Trojan War, but is dead before the play begins. It opens with Helen visiting his tomb. According to Euripides, Proteus was married to the Nereid Psamathe, had a son Theoclymenos, and a daughter Theonoe who was a gifted seer. Theoclymenos became the new king of Egypt after Proteus and had intentions of marrying Helen.
- Euripides, Euripides II: The Cyclops and Heracles, Iphigenia in Tauris, Helen (The Complete Greek Tragedies) (Vol 4), University Of Chicago Press; 1 edition (April 15, 2002). ISBN 978-0-226-30781-7.
- Herodotus; Histories, A. D. Godley (translator), Cambridge: Harvard University Press, 1920; ISBN 0-674-99133-8. Online version at the Perseus Digital Library.