Encyclopedia Britannica:
http://www.sundaysun.co.uk
DONNYBROOK, a part of Dublin, Ireland, in the south-east of the city. The former village of the name was famous for a fair held under licence from King John in 1204. It gained, however, such a scandalous notoriety for disorder that it was discontinued in 1855
http://www.sundaysun.co.uk
http://www.guardian.co.uka real good Donnybrook it was too, with punches flying in from both sides
Nothing like a good punch-up for making politics interesting.
Yet in truth, what happened before the minor donnybrook was much more important.