'The Clans, Sept and Regiments of the Scottish Highlands' (1908) by Frank Adam, is the first document of the tartan. The history of the Clan MacAlpine is obscure. The Siol Alpin is claimed as the origin of a number of clans, but as D.C. Stewart remarks, "belongs rather to mythology than to history." It is considered to be a branch of the royal Clan Alpin, of the Kings of Dalriada. The tartan is similar to the hunting MacLean, but for the yellow lines. Other tartans connected with Siol Alpin are red.