Liberton parish consisted of  of land, and it is likely that Máel Bethad owned the upper part of the parish. Máel Bethad's name occurs as a witness on many of King David's charters, where it is rendered in a number of corrupt forms, e.g.
The Liberton parish included a specific piece of land, with Máel Bethad possibly owning the upper part. Máel Bethad's name is commonly found among the witnesses on documents signed by King David, often appearing in various misspellings like: