Princess Cadance is an Alicorn pony who is first featured in the season two finale alongside her husband Shining Armor (after the season two finale). Her debut episode gives her proper title as Princess Mi Amore Cadenza. She is Twilight Sparkle's former foal-sitter and sister-in-law (after marrying Shining Armor in A Canterlot Wedding - Part 2). "Castle" proclaims her as "The Crystal Princess!" at the end of The Crystal Empire - Part 2, and a blurb on one of the toy sets featuring Cadance says that she and Shining Armor "lead the Crystal Empire together!"
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MLP:FIM The Pegasisters guide book
Losoweevery pegasister needs to know this, so why not have it all in one place?