Finally the Synod defined the boundaries of the dioceses to which the sees severally belonged. It is not my purpose to give a minute description of these boundaries. That would involve an excursus on Irish topography, which would be, to say the least, out of place. It will suffice to indicate roughly those of the five dioceses of Ulster. To the west was what was called the "parish" (_fairche_)[51] of Derry or Raphoe. It was nearly identical with our diocese of Raphoe. The only important difference is that it included Inishowen, the district between Lough Swilly and Lough Foyle, which now belongs to the diocese of Derry. Next to the parish of Derry or Raphoe the Synod placed the parish of Ardstraw.[52] Ardstraw never became the see, and the diocese was subsequently known as "of Derry." It extended eastward to the Carntougher Mountains, and coincides pretty closely with the present diocese. It subsequently gained Inishowen from its western neighbour, and the strip between the Carntougher Mountains and the Bann from its eastern neighbour. But otherwise it remains much as the Synod of Rathbreasail determined. Next to it was to be the parish of Connor or Down. When the portion of it to the west of the Bann was transferred to Derry, it coincided almost exactly with the modern Down, Connor and Dromore. On the other hand the parish of Armagh seems originally to have included the modern county of Monaghan: it has shrunk to little more than half its size. The parish of Clogher, at first very small, has extended east and west, and is three times as large as it was intended to be. On the whole the work of the Synod has stood well the test of many centuries of history.