"The "Laws and Constitutions of the Loyal Orange Institution of Scotland", 1986 state: "No ex-Roman Catholic will be admitted into the Institution unless he is a Communicant in a Protestant Church for a reasonable period." Likewise the "Constitution, Laws and Ordinances of the Loyal Orange Institution of Ireland" (1967) state: "No person who at any time has been a Roman Catholic.... shall be admitted into the Institution, except after permission given by a vote of seventy five per cent of the members present founded on testimonials of good character . . . "(39) In the 19th century, Rev. Dr. Mortimer O'Sullivan, a converted Roman Catholic was a Grand Chaplain of the Orange Order in Ireland.

In the 1950's Scotland also had a converted Roman Catholic as a Grand Chaplain - Rev. William McDermott"

quote taken from the article:- 

THE ORANGE ORDER:

An Evangelical Perspective

ORANGEISM COMPARED WITH FREEMASONRY

SOME EVANGELICAL OBJECTIONS CONSIDERED

A REPLY TO W.J.McK.McCORMICK

By REV. IAN MEREDITH B.A., M.Th. Grand Chaplain Grand Orange Lodge of Scotland & REV. BRIAN KENNAWAY M.A. Deputy Grand Chaplain Grand Orange Lodge of Ireland