The chiefs of the Scottish highland Clan Mackenzie were historically known as the Mackenzies of Kintail. By tradition the Mackenzie chiefs descend from Kenneth Mackenzie, 1st of Kintail (d. 1304) however their earliest ancestor proven by contemporary evidence is Alexander Mackenzie, 6th of Kintail (d. 1488). The chiefly line became the Earls of Seaforth during the 17th century but this title was later forfeited in the 18th century due to support of the Jacobite rising of 1715. The current official chief of the Clan Mackenzie is John Ruaridh Grant Mackenzie, 5th Earl of Cromartie.