Fra' Emmanuel de Rohan-Polduc (18 April 1725 la Mancha, Spain – 14 July 1797 Valletta, Malta) was a member of the wealthy and influential Rohan family of France, and 70th Prince and Grand Master of the Order of St. John from 1775 to 1797.De Rohan was born in la Mancha, Spain on 18 April 1725. His father was French, but had been banished to Spain. He served in the courts of Madrid and Parma, before becoming an ambassador to Francis I. He eventually joined the Order of St.