to help with your translations, Keberoxu

Cathair na dTreabh, city of the Tribes is a name for Galway/Gallaimh

An Mhodhscoil, modhscoil - I'm more familiar with the word Bunscoil for a primary school perhaps An Mhodhscoil is fashioned after the English language "the Model School". An Mhodhscoil Láir was in Dublin. In this case I suppose láir is from lár (middle, central) and that the school was centrally located. Or could it mean a meánscoil, intermediate/
middle school?