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Batman reveals to Nightwing that his great-grandfather was a Talon, and that had Dick Grayson not been taken in by Bruce Wayne, then he would also have been turned into a Talon. It seems Haly’s Circus presents a crop of candidates to the Court of Owls every decade, and the members choose one in secret to be trained as that era’s Talon.
From – Batman Vol. 2 #7