See also the home page of the Texts and Translations book series MHRA Library of Medieval Welsh Literature

Early Welsh Gnomic and Nature Poetry
Edited by Nicolas Jacobs1 March 2012
A Selection of Early Welsh Saga Poems
Edited by Jenny Rowland1 September 2014
Historical Texts from Medieval Wales
Edited by Patricia Williams29 October 2012
Medieval Welsh Political Poetry
Edited by Helen Fulton 
Hystoria Gweryddon yr Almaen: The Middle Welsh Life of St Ursula and the 11,000 Virgins
Edited by Jane Cartwright 20 July 2020
Arthur in Early Welsh Poetry
Edited by Nerys Ann Jones12 July 2019
Delw y Byd: A Medieval Welsh Encyclopedia
Edited by Natalia I. Petrovskaia 30 November 2020
An Old Welsh Reader
Edited by Simon Rodway 31 December 2022