There was cross-over between many of the annals, parts of which were copied from each other, but each collection reflects something of the monastery and district in which it was compiled. The "Annals of Ulster" reflect the viewpoint of counties Armagh, Fermanagh, Londonderry and the northern part of the province of Connacht. It was authored by Cathal Mac Manus, a 15th-century diocesan priest, and is considered one of the most important, "possibly the single most important", record of events in medieval Ireland. The "Chronicon Scotorum" (as with the "Annals of Tigernach", "Clonmacnoise" and "Roscrea") reflects political and ecclesiastical events relevant to the monastery and environs of Clonmacnoise in Leinster. The "Annals of Innisfallen" reflect the Munster viewpoint, in particular the monastery of Emly.