This peace was not more durable.

{1093.} Malcolm, two years after, levying an army, invaded England; and after ravaging, Northumberland, he laid siege to Alnwick, where, a party of Earl Moubray's troops falling upon him by surprise, a sharp action ensued in which Malcolm was slain.

This incident interrupted for some years the regular succession to the Scottish crown, Though Malcolm left legitimate sons, his brother Donald, on account of the youth of these princes, was advanced to the throne; but kept not long possession of it.

Duncan, natural son of Malcolm, formed a conspiracy against him; and being assisted by William with a small force, made himself master of the kingdom.

New broils ensued with Normandy.