 For example, Leslie Alcock has argued that that approach to property and estates cannot pre-date the 6th century and is thus post-Roman.There was little Latin linguistic heritage left to the Welsh language, only a number of borrowings from the Latin lexicon.With the absence of early written Welsh sources there is no way of knowing when these borrowings were incorporated into Welsh, and may date from a later post-Roman era when the language of literacy was still Latin.