An attempt has been made in the following pages to put on record what can be discovered concerning the descendants of two Irish families which became allied in 1737 by the marriage of the Rev. Andrew Nixon with Marianne French. The various families detailed on pp. 83-127, are descended from that marriage. The Public Record Office contains evidence of the existence of many other persons of the names of French and Nixon, who, from the localities in which they lived, were very probably of the same stock, but as no proof of their relationship has been forthcoming, as a rule they have not been mentioned in the book. It has been found necessary to condense the work as much as possible, and to leave out some biographical details which might have been inserted. I have tried in most instances to give chieﬂy those which come from unfamiliar sources. The evidence for the earlier generations in the 17th and 18th centuries is in almost every case clear and complete. In the very few instances where the exact connection of certain persons with the family has not been discovered, due mention has been made of the fact. For the details regarding the later generations I have to thank a host of correspondents. In some cases information could not be obtained. I have to acknowledge assistance derived from the genealogical works of Foster and Burke.