AOH From the AOH Website: © Copyright Ancient Order of Hibernians in America, Inc., All rights reserved. The Ancient Order of Hibernians is America’s oldest Irish Catholic Fraternal Organization founded concurrently in the coal-mining region of Pennsylvania and New York City in May,1836. The Order can trace its roots back to a series of similar societies that existed in Ireland for more than 300 years. However, while the organizations share a common thread, the North American A.O.H. is a separate and much larger organization.