Aldus was designed as a book weight text face companion for Palatino, which Zapf considered to be a display typeface. Aldus (which Zapf wished to be called Palatino Book) is designed to complement Palatino, but with a lighter stroke weight, more open counters, and better suited for text in smaller point sizes.
Aldus nova was also designed by Hermann Zapf, with Akira Kobayashi. A bold weight is added into the font family. The character set support is similar to Palatino nova, but Greek and Cyrillic are not available in book weight fonts. The bar in ampersand is only available in book roman font.