Constantine, the son of Kenneth, succeeded his uncle Donald, and soon found himself involved in a dreadful conflict with the Danish pirates. Having, after a contest which lasted half a century, established themselves in Ireland, and obtained secure possession of Dublin, the Vikingr directed their views towards the western coasts of Scotland, which they laid waste. These ravages were afterwards extended to the whole of the eastern coast, and particularly to the shores of the Frith of Forth; but although the invaders were often repulsed, they never ceased to renew their attacks. In the year 881, Constantine, in repelling an attack of the pirates, was slain at a place called Merdo-fatha, or Werdo, probably the present Perth, according to Maclauchlan. Aodh or Hugh, _the fair-haired_, succeeded his brother Constantine. His reign was unfortunate, short, and troublesome. Grig, who was Maormor, or chief, of the country between the Dee and the Spey, having become a competitor for the crown, Aodh endeavoured to put him down, but did not succeed; and having been wounded in a battle fought at Strathallan, (or possibly Strathdon,) he was carried to Inverurie, where he died, after lingering two months, having held the sceptre only one year. Grig now assumed the crown, and, either to secure his possession, or from some other motive, he associated with him in the government Eocha, son of Ku, the British king of Strathclyde, and the grandson, by a daughter, of Kenneth Macalpin. After a reign of eleven years, both Eocha and Grig were forced to abdicate, and gave way to Donald IV., who succeeded them in 893. During his reign the kingdom was infested by the piratical incursions of the Danes. Although they were defeated by Donald in a bloody action at Collin, said to be on the Tay, near Scone, they returned under Ivar O’Ivar, from Ireland, in the year 904, but were gallantly repulsed, and their leader killed in a threatened attack on Forteviot, by Donald, who unfortunately also perished, after a reign of eleven years. In his reign the kings of present Scotland are no longer called _reges Pictorum_ by the Irish Annalists, but _Ri Alban_, or kings of Alban; and in the Pictish Chronicle _Pictavia_ gives place to _Albania_.