The Ogham alphabet comes into use, just to make life difficult. Available at an ogham stone near you. Saint Patrick arrives. Snake lovers everywhere go into mourning, and the stage is set for the brewing of green Guinness . 433 AD- Patrick lights a big pagan bonfire on the hill of Slane to announce the arrival of Christianity .
Students arrive from all over Europe to study on the Isle of Saints and Scholars .
The first traffic cones are introduced, and are promptly stolen. The Brehon Laws are written down, setting the basis for the Gaelic legal system for centuries to come. Soon the country is awash with tribunals . The Vikings arrive. The Vikings continue to wreak havoc, and in between bouts of pillaging and raping find time to found Dublin in 840.