Aha. I saw him in the tag, and was likeThistleclaw is a clan can from Thundeclan in Warriors: Bluestar's Prophecy. Thistleclaw's apprentice, Tigerclaw almost managed to destroy his clan and bring the entire forest under his control. Part of the reason Tigerclaw was so bloodthirsty and ambitious is from ideas he got from Thistleclaw.
*donates eagles that attacked the clan cats on their way to their new home*