Talk:Princess Cadance/@comment-33300401-20140830110611/@comment-33300401-20140905191000

Perhaps Tirek found out about Cadence after he broke out in Season 2. Though he probably wasn't able to know about the 4th princess (Twilight) because he had to go back into hiding after Celestia found out about he's escape.

Maybe he was hiding outside Equestria during Season 3, thus not finding out about a Twilight being a princess - we don't know how exactly news travels throughout the entire planet.

Just a guess.