From left to right: Farith Redloss, Luther, Lion, Corswain, Holguin.
Lion El'Jonson, also known as The Lion and The First, is the Primarch of the Dark Angels. He was scattered along with the other Primarchs to the far corners of the galaxy. He finally came to rest on the world Caliban, a beautiful but blighted world tainted by Chaos due to its proximity to the Eye of Terror. Lion El'Jonson was renowned for a level of strategic brilliance and martial prowess that was rivaled perhaps only by Horus, but was distrusted by his brother Primarchs for his secretive and taciturn nature. The Chaos emissary to Lorgar called him the Duelist.
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Cause this is just too BADASSED!
But he was a major candidate for Warmaster, having Tactical and Strategic skills that match Horus, and Combat prowess that was more then a match for is brothers, it says in canon the only two reasons he was selected that the Lion was thought to be to secretive, and that he was among the Last Primarchs to be found.