Ironclaw is a fantasy role-playing game published by Sanguine Productions, in which players take on the roles of anthropomorphic animals. The game is set in a Renaissance-inspired fictional universe on a continent called Calabria. The primary theme of the game involves four noble houses embroiled in political hostilities, with players taking the roles of citizens and adventurers.
Since its initial publishing, the Ironclaw core book has undergone a revision to bring it more in line with Jadeclaw, which has cleaner rules. The revised Ironclaw contains numerous errata and corrections, some new artwork, and an expanded section for game hosts. The cover of the first two printings of Ironclaw sourcebook bears a strong resemblance to the cover of Slayers The Motion Picture, with small changes. The "Ninth Anniversary Edition", released in 2009, depicts the characters from the original cover cowering before Amalsand Jakoba, the canon arch-villainess of the setting.
The current edition, Ironclaw: Squaring the Circle, was released in 2010 with new rules and art, as well as a supplement, Ironclaw: Book of Mysteries. A new version of Noggle Stones, using the same revised rule system, was released as well.
A number of supplement books have been released over the years, detailing the various cultures of Calabria and providing new rules and sample adventure modules.
Source: Wikipedia, "Ironclaw", available under the CC-BY-SA License.