Scottish clan clan) this led to territorial disputes and warfare. The "fine" resented their clansmen paying rent to other landlords. Some clans used disputes to expand their territories. Most notably, the Clan Campbell and the Clan Mackenzie were prepared to play off territorial disputes within and among clans to expand their own land and influence. Feuding on the western seaboard was conducted with such intensity that the Clan MacLeod and the Clan MacDonald on the Isle of Skye were reputedly reduced to eating dogs and cats in the 1590s. Feuding was further compounded by the involvement of Scottish clans in the wars
Kenneth III of Scotland (Lulach mac Gille Coemgáin), would briefly succeed Macbeth as King of Scotland. The meic Uilleim, descendants of William fitz Duncan by his first marriage, were probably descended from Kenneth; and the Clann Mac Aoidh or Clan Mackay claim descent from Kenneth III through Lulach's daughter. The theory that Clan MacDuff were descendants of Kenneth III was based on their close connection to royalty. Andrew of Wyntoun reported that Malcolm III of Scotland (reigned 1058–1093) had granted to a "MacDuff, thane of Fife" the privilege of enthroning the kings of Scots at their inauguration. While John of Fordun has Malcolm III