Cambrobrytannicae Cymraecaeve linguae institutiones et rudimenta

The work Cambrobrytannicae Cymraecaeve linguae institutiones et rudimenta was written by Siôn Dafydd Rhys, a Welsh physician and grammarian. Published in 1592, it was the first grammar to explain the Welsh language using Latin as the medium. Rhys's book aimed to codify the rules of bardic poetry and the principles of the Welsh language, though it followed Latin grammatical structures. The work includes a Welsh greeting, a grammar of the language, a section on poetic art, and a collection of Welsh poetry, preserving knowledge that might otherwise have been lost. This publication is considered part of the Welsh Renaissance, a period when Wales looked to its classical bardic traditions.12