Aroueris (Gr.). The god Harsiesi, who was the elder Horus. He had a temple at Ambos. if we bear in mind the definition of the chief Egyptian gods by Plutarch, these myths will become more comprehensible; as he well says: “Osiris represents the beginning and principle; Isis, that which receives; and Horus, the compound of both. Horus engendered between them, is not eternal nor incorruptible, but, being always in generation, he endeavours by vicissitudes of imitations, and by periodical passion (yearly re-awakening to life) to continue always young, as if he should never die.” Thus, since Horus is the personified physical world, Aroueris, or the “elder Horus”, is the ideal Universe; and this accounts for the saying that “he was begotten by Osiris and Isis when these were still in the bosom of their mother”—Space. There is indeed, a good deal of mystery about this god, but the meaning of the symbol becomes clear once one has the key to it.
Source: H.P.Blavatsky - The Theosophical Glossary