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
Historical Texts from Medieval Wales
Edited by Patricia Williams29 October 2012
Hystoria Gweryddon yr Almaen: The Middle Welsh Life of St Ursula and the 11,000 Virgins
Edited by Jane Cartwright20 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 31 December 2020