In both Robert Jordan’s books and Amazon’s small-screen adaptation, Rand eventually stood revealed as the prophesied reincarnation of Lews Therin “Kinslayer” Telamon.
While the show made the mystery last until the season’s penultimate episode, the big twist didn’t come without a proper setup.
Nynaeve was an early suspect because of her shocking capabilities with the One Power, and Mat’s odd behavior was a major misdirect.