 This included experimental archaeology, which retraced a long and arduous pilgrimage route from Llantarnam Abbey, through the granges of St Dials and Llandderfel, before arriving at Penrhys in the Rhondda; A post medieval survey of Henry the Earl of Pembroke's manor of Mynyddislwyn which includes many aspects of medieval land use deducted from the survey.Gray also examines the political situation in south Wales regarding the establishment of land endowment and the foundation of granges in south east Wales.The study of the place-names relating to Llantarnam has resulted in general agreement across different studies, although there a few anomalies.