From WoWWiki

Raleigh the Devout is a level 30 quest giver located in Southshore in the contested territory of Hillsbrad Foothills. He is an ex-member of the Scarlet Crusade, which he left after witnessing people being tortured because they did not bear the tabard of the Scarlet Crusade. Apparently, Scarlet Crusader Emissary Brother Anton in Desolace believes that Raleigh is still loyal to the cause, and directs loyal Alliance members to him for further service to the Crusade after they prove themselves in combat against Desolace's undead.

After informing the sent Alliance members of the true nature of the Crusade, Raleigh sets his plan into motion: the assassination of several key figures in the Scarlet Monastery, including Houndmaster Loksey, Herod, High Inquisitor Whitemane, and Scarlet Commander Mograine.

Raleigh starts the quest  [40D] In the Name of the Light (Dungeon)

See List of Hillsbrad Foothills NPCs.

References

A paladin named Raleigh the True can be found in the Town Hall in Southshore conversing with Nathanos Marris in the Old Hillsbrad Foothills instance of the Caverns of Time. It is believed to be the same Raleigh. The armor is the same, and both have the same face and beard, though his hairline has receeded since then. Why his title changed from True to Devout is unknown.