When Rand undertook his journey to become Car'a'carn, his chief rival was Couladin, an Aiel warrior who declared himself to be clan chief of the Shaido Aiel. Couladin hated Rand from the instant he saw him, but later reinforced his own claim by revealing that he
also had a dragon tattoo on each arm, later revealed to have been placed there by Asmodean in an attempt to distract Rand.
However, given how he received this, it seems unlikely he didn't know the source or what it entailed. Then again, he never seemed like a stable individual to begin with, and may have simply believed he woke up like that one morning.
Was Couladin a Darkfriend... or just plain nuts?