Thomas Grenville was a British politician and bibliophile.

The Mainz Psalter was the second major book printed with movable type in the West; the first was the Gutenberg Bible. It is a psalter commissioned by the Mainz archbishop in 1457. The Psalter introduced several innovations: it was the first book to feature a printed date of publication, a printed colophon, two sizes of type, printed decorative initials, and the first to be printed in three colours. The colophon also contains the first example of a printer's mark. It was the first important publication issued by Johann Fust and Peter Schoeffer following their split from Johannes Gutenberg.