The Normans replaced traditional clan land management (Brehon Law) with the manorial system of land tenure and social organisation.
This led to the imposition of the village, parish and county over the native system of townlands.
Little of this had changed by the time of the Norman invasion of Ireland in the 12th century.
For most of its recorded history, Ireland's culture has been primarily Gaelic (see Gaelic Ireland).Christmas in Ireland has several local traditions, some in no way connected with Christianity. Stephen's Day), there is a custom of "Wrenboys" who call door to door with an arrangement of assorted material (which changes in different localities) to represent a dead wren "caught in the furze", as their rhyme goes.The national holiday in the Republic of Ireland is Saint Patrick's Day, that falls on the date 17 March and is marked by parades and festivals in cities and towns across the island of Ireland, and by the Irish diaspora around the world.The Brigid's cross made from rushes represents a pre-Christian solar wheel.Other pre-Christian festivals, whose names survive as Irish month names, are Bealtaine (May), Lúnasa (August) and Samhain (November).With the gradual extension of English feudalism over the island, the Irish county structure came into existence and was completed in 1610.These structures are still of vital importance in the daily life of Irish communities.The festival is in remembrance to Saint Patrick, the patron saint of Ireland.Pious legend credits Patrick with the banishing of the snakes from the island, and the legend also credits Patrick with teaching the Irish about the concept of the Trinity by showing people the shamrock, a 3-leaved clover, using it to highlight the Christian belief of 'three divine persons in the one God'.As archaeological evidence from sites such as the Céide Fields in County Mayo and Lough Gur in County Limerick demonstrates, farming in Ireland is an activity that goes back to the very beginnings of human settlement.In historic times, texts such as the Táin Bó Cúailinge show a society in which cattle represented a primary source of wealth and status.