From Halopedia, the Halo wiki
'Rduan was a Sangheili Shipmaster during the post-Human-Covenant War era.
In March 2553, 'Rduan commanded the Covenant destroyer Defender of Faith. He sided with the Servants of Abiding Truth in the Blooding Years. His arrival in the state of Vadam was met with praise by the Abiding Truth, as his warship was one few still in their possession. He was later killed when his ship was destroyed by the UNSC Infinity.