Ireland was part of the domain of the English crown for 800 years. There is no way that the current Irish population is below that of 1169 when Strongbow invade

Ireland was part of the domain of the English crown for 800 years. There is no way that the current Irish population is below that of 1169 when Strongbow invaded. At the time Ireland's only cities were those founded by the Vikings and they were by any modern standard towns. The rest of the island was mostly pastoral. Anyone with the slightest knowledge of Irish history would know that.