Katherine Pastoria gave birth to a daughter, Ozma, with her husband Samuel.
After the Wizard's accession to the throne, he charged his right hand, Eamonn, to kill both Katherine and Samuel. She attempted to protect herself with her daughter's emerald dagger, but to no avail.
Behind the scenes
In L. Frank Baum's Oz novels, Ozma's mother is the fairy queen Lurline, though she is not King Pastoria's wife. She also the creator of the land of Oz.