The ancient kings of Ireland, as well as the kings of the four provinces of Leinster, Munster, Connaught, and Ulster, were subject to certain quaint prohibitions or taboos, on the due observance of which the prosperity of the people of the country, as well as their own, was supposed to depend. Thus, for example, the sun might not rise on the king of Ireland in his bed at Tara, the old capital of Erin; he was forbidden to alight on Wednesday at Magh Breagh, to traverse Magh Cuillinn after sunset, to incite his horse at Fan-Chomair, to go in a ship upon the water the Monday after Bealltaine (May day), and to leave the track of his army upon Ath Maighne the Tuesday after All-Hallows. The king of Leinster might not go round Tuath Laighean left-hand-wise on Wednesday, nor sleep between the Dothair (Dodder) and the Duibhlinn with his head inclining to one side, nor encamp for nine days on the plains of Cualann, nor travel the road of Duibhlinn on Monday, nor ride a dirty black-heeled horse across Magh Maistean. The king of Munster was prohibited from enjoying the feast of Loch Lein from one Monday to another; from banqueting by night in the beginning of harvest before Geim at Leitreacha; from encamping for nine days upon the Siuir; and from holding a border meeting at Gabhran. The king of Connaught might not conclude a treaty respecting his ancient palace of Cruachan after making peace on All-Hallows Day, nor go in a speckled garment on a grey speckled steed to the heath of Dal Chais, nor repair to an assembly of women at Seaghais, nor sit in autumn on the sepulchral mounds of the wife of Maine, nor contend in running with the rider of a grey one-eyed horse at Ath Gallta between two posts. The king of Ulster was forbidden to attend the horse fair at Rath Line among the youths of Dal Araidhe, to listen to the fluttering of the flocks of birds of Linn Saileach after sunset, to celebrate the feast of the bull of Daire-mic-Daire, to go into Magh Cobha in the month of March, and to drink of the water of Bo Neimhidh between two darknesses. If the kings of Ireland strictly observed these and many other customs, which were enjoined by immemorial usage, it was believed that they would never meet with mischance or misfortune, and would live for ninety years without experiencing the decay of old age; that no epidemic or mortality would occur during their reigns; and that the seasons would be favourable and the earth yield its fruit in abundance; whereas, if they set the ancient usages at naught, the country would be visited with plague, famine, and bad weather.