10176 King's Castle is a Knights' Kingdom set released in 2006 and was only available in LEGO Stores and LEGO's online shop. The set was also sold at Costco stores in 2008 as the Royal Castle, where the "Knights' Kingdom" label was replaced with a "Special Edition" label. It contains a large castle, a small attack force with a Ballista siege cart, and twelve minifigures in total, including a ghost, two skeletons, and two mounted knights with horses, as well as a king.