Since "Chrestomanci" is a title rather than a personal name, there might be some confusion as to which actual character is meant. The Chrestomanci most usually mentioned is Christopher Chant, who ages from childhood in The Lives of Christopher Chant to middle age in most of the other titles.
The series includes:
Titles in italics are novels. Titles in "quotation marks" are short stories, and are collected in Mixed Magics.