Joseph P. Clancy, Medieval Welsh Poems. Dublin, Four Courts Press, 2003. Gwyn Thomas, Dafydd ap Gwilym: His Poems. Cardiff, University of Wales Press, 2001. Barry Lewis, Welsh Poetry and English Pilgrimage: Gruffudd ap MAredudd and the Rood of Chester. Aberystwyth, University of Wales Centre for Advanced Welsh and Celtic Studies, 2005. Peritia 21.