From Halopedia, the Halo wiki
Inslaan 'Gadogai is a mysterious, short-tempered Sangheili blademaster serving the Keepers of the One Freedom. He was a veteran of the Silent Shadow during the time of the Covenant, before rebelling against the High Prophet of Truth and Tartarus' Jiralhanae leadership at the onset of the Great Schism. By 2559 he was a mercenary serving the Banished as an eye for Escharum, before leaving them in favor of Castor and the Keepers of the One Freedom.
Stabilizing the Banished on Reach
Defection to the Keepers of the One Freedom
When Atriox arrived at Reach on a Lich via portal from the Ark, Inslaan 'Gadogai failed to block Castor and his Keepers of the One Freedom from boarding the Lich after Atriox and his crew exited it. Atriox ordered 'Gadogai to kill Castor and his Keepers for betraying him, to which 'Gadogai ignored and betrayed the Banished in turn by escaping to the Ark with the Keepers. Castor welcomed 'Gadogai as an official member of the Keepers of the One Freedom as they flew through the Portal back to the Ark.
List of appearances