Star Swirl the Bearded

Star Swirl the Bearded  is a male  unicorn  who appears in the IDW comics  and is alluded to in the show  and other media. He is first mentioned by Twilight Sparkle  in  Luna Eclipsed  as "the most important conjurer of the pre-classical era." Twilight, Spike  and Pinkie Pie  visit a wing in the Canterlot  Library named after him, which houses time-related spells, in the episode It's About Time.