All I have, from *John Briggs of Sandwich Mass and His Descendants*, p. 38 (there may be more on p. 37 but I didn't Xerox it...) is that Rhoda was the daughter of Silas Briggs and Elizabeth Leach. Rhoda was b. Rochester, MA29 Sept. 1788, married Joe:) and ***died in Rochester MA on 8 July 1820, age 32 years.
Do you have any information about your Joseph Allen?I think we might... possibly... have a connection. I'm trying to link my multi-gt grandmother Elizabeth Briggs who married one Ephraim Allen in Rochester 1795. Not only can I NOT find Elizabeth's parents (!) but I can't find Ephraim's, either ! (There are too many "Ephraim Allens" and not one of them has the right dates!)