This volume contains the full texts of 175 acts issued under the seal of King Alexander III, together with notes on a further 155 ‘lost acts’ that survive only in notices. These acts, many of which have never been published before, have been collected from a variety of archives in Scotland, England, Belgium and France. The Introduction examines the administrative contexts of the later thirteenth century in which the royal chancery drafted and authenticated charters, brieves and other written instruments, and the varied sources from which the collection is compiled. The texts include full Latin transcriptions and detailed English-language summaries of the contents of each act, together with a series of notes and comments on context and significance.