To become monarch in the Cranath Kingdom one must be an Ætheling. Æthelings are royal members of the House of Cranath. More specifically, an Ætheling is a child, grandchild or greatgrandchild of a previous monarch.

Æthelings are also the only people eligible to become duke or duchess of one of the three duchies in the original Cranath Kingdom: the Duchies of Morand Shores, Glaron Fields and Dorunth Uplands. When one of these duchies is vacant, the monarch appoints an Ætheling to the open seat.