Manuscript1247 of the Österreichische Nationalbibliothek (Austrian National Library) in Viennais a parchment codex of 160 folios which contains the epistles of St Paul in beautifully executed letters. The codex is an autograph of Marianus Scottus alias Muiredach mac Robartaig who wrote it in the course of the year1079, as the colophon at the end of the manuscript reveals (gloss 5). Marianus Scottus, hailing from the area of modern Donegal,was the founder of the Benedictine Schottenkloster in Regensburg/Ratisbon(Bavaria, Germany); he is even credited with the initiation of the South-Ger-man tradition of Schottenklösteras a whole(Ó Clabaigh 2005: 405). Marianus died in 1081, not long after the completion of the manuscript that is the subject of the present article. A vita written around a century after his death contains information about his life (Dilworth 1965; Weber 2010). The Maria-nus Scottus from Regensburg must not be confused with his Latin namesake, the exactly contempor-ary chronicler Marianus Scottus alias Máel Brigte from Mainz, originally also from the north of Ire-land,who died in 1082.