The Sabon design is closely related to the Garamond font styles of the sixteenth century and is considered a beautiful, highly legible typeface face. It was based upon a particular type cut by Claude Garamond (1480-1561), a famous Parisian publisher and one of the most influential printers of all time.
A serif roman type style was used extensively in book publications at that time, and later became favored by the Egenolff-Berner foundry based in Frankfurt, Germany. One of Garamond’s students, Jacques Sabon, worked for the foundry after leaving Garamond’s tuition, and it was for Sabon that Tschichold’s creation was named.
The Sabon design was initially created as the response to a request by a German type foundry for a face with equal spacing in the Roman and Italic versions, which would therefore create less of a workload when it came to typesetting. They also wanted a font that would behave the same way across the three tangible forms of technology available at the time: single-type machine composition, foundry type for hand composition and linecasting.
References:
Identifont: EF Garamond No. 5
Typedia: Sabon
Art Director's Club: Jan Tschichold
Identifont: Sabon