(Ἡλίων), or HE'LION, magister officiorum, A. D. 414-417, 424-427, under Theodosius II. He is also called Patricius by Olympiodorus. (Comp. Cod. Theod. 6. tit. 27. s. 20. and 7. tit. 8. s. 14.) He was commissioned by Theodosius to invest with the robe of Caesar, at Thessalonica, A. D. 424, the boy Valentinian III., then in exile [GALLA, No. 3]; and after the overthrow and death of the usurper Joannes, he invested Valentinian at Rome, A. D. 425, with the robes and crown of Augustus. Helio had, before these transactions (A. D. 422), been engaged by Theodosius, by whom he was much esteemed, in negotiating a peace with the Persian king Varanes. (Cod. Theod. 13. tit. 3. s. 17; 6. tit. 27. ss. 17, 18, 19, 20; 7. tit. 8. s. 14; Gothofred. Prosop. Cod. Theod.; Olympiod apud Phot. Bibl. Cod. 80; Socrat. H. E. vii 20, 24; Theophan. Chronog. vol. i. p. 134, ed. Bonn; Tillemont, Hist. des Emp. vol. vi.)