tretis

[19] In the MSS. this is called: A pystyll of discrecion in knowenge of spirites; or: A tretis of discrescyon of spirites.

The Cell of Self-Knowledge : seven early English mystical treatises printed by Henry Pepwell in 1521 Henry Pepwell 1902

Englisshe mile out of Boys, seint Vyncent token a strong abbeie with tretis.

A Chronicle of London from 1089 to 1483 Written in the Fifteenth Century, and for the First Time Printed from MSS. in the British Museum Anonymous 1823

Ye maye take apart an astrolabe and undirstond the natur of yts operacioun (and Ich have a smal tretis on that topique ywrit), but ther ys a maner of rough cloth that covereth the good fayre fruit of the world of fayerye, the which nat the gretest historian, nor even the joyned myghte of every historyan that ever did a footnote wryte, kan teare apart (thogh thei be mighty at arm-wrestling).

Geoffrey Chaucer Hath a Blog 2010

Composites.] ¶ The auctor of þis tretis dep {ar} tys þis worde a nomb {ur} into 3

The Earliest Arithmetics in English Anonymous 1902