A Tulchan (from the Scottish Gaelic, tulachan) was in Scotland a man appointed as bishop after the Reformation, who was a bishop in name only and whose revenue was drawn by his patron. The term originally referred to a calfskin stuffed with straw and presented to a cow, as if living, to induce her to give milk. The epithet Tulchan applied to the bishops is usually ascribed to the reformer and collector of Scottish proverbs David Fergusson.[1]
Mr. Gladstone, during his electioneering raid into Midlothian in November 1879, explained the meaning of "tulchan", which he spelt "tulcan":
Jamieson writes the word "tulchane", and cites the phrase, "a tulchane bishop", as the designation of one who received the episcopate on condition of signing the temporalities to a secular person. One of them, Robert Montgomery (before 1550–1609), was prosecuted by the religious reformer Andrew Melville (1545–1622). In some parts of Scotland, the people say a "tourkin calf" instead of a "tulcan calf". Jamieson further states:
In other words, a "tulchan" can also be a living animal, and the usage is of one who gains profit by pretending to be someone, or something else.