[Sections 1 and 3 of this Introduction were slightly adapted from the Introductory Sections 1 and 10 in SkP VII, written by Margaret Clunies Ross, and Section 4.1 is based on Section 4 of SkP II, co-authored by Kari Ellen Gade and Diana Whaley, while the stemma in that section was formatted by Tarrin Wills. Edith Marold was responsible for Sections 4.2.1, 5, 7 and 8, Margaret Clunies Ross wrote Section 4.2.5, Elena Gurevich Section 4.2.3 and Tarrin Wills Section 4.2.4. The remaining sections of the Introduction were written by Kari Ellen Gade.]