I am a descendant of Stephen Monroe Allen and his second wife Nancy Parlee Godwin.
Look in Representative Men and Old Families of Rhode Island Vol. 1 1908.
It lists John A Allen born in Wales in 1640 on page 536-538.Wonderful genealogy information.This was given to me by a relative in the Memphis TN area.
Also look in the LDS library--Christopher Allen AFN:1Q0V-C2F.There is a world of information.I have been unable to document the accuracy of this information, but it is an excellent foundation from which to start.