Who is Ruth King from On Writing: A Memoir of the Craft and what is their importance?

Ruth King was Stephen King's mother. Ruth was a single mother ahead of her time. Ruth worked many jobs, many of them laborious, in order to provide for her children. Ruth would move around a lot, moving from town to town in order to be close to her many family members. When Ruth's parents became old and infirmed, Ruth moved into their home in order to care for them. Ruth would remain in this house until the last few months of her life.