from Latin fœditātem, from fœdus foul: + -ity
1542 - Udall in Letters of Eminent Literary Men (see Example below)
From: Original Letters of Eminent Literary Men,
of the Sixteenth, Seventeenth, and Eighteenth Centuries
With Notes by Sir Henry Elllis
Printed for the Camden Society, 1843
Nicholas Udall to ...... complaining of misfortunes, and craving protection.