Twelve Kingdoms Books in Order: 2 Different Series

2 separate series are called Twelve Kingdoms: Twelve Kingdoms by Jeffe Kennedy, starting with The Mark of the Tala (2014); and Twelve Kingdoms by Esther M. Friesner, starting with Mustapha and His Wise Dog (1985). Each series is listed below in its own publication order, with its own page for the full detail.