According to McPartland's "History of East Greenwich," Richard Briggs and his family lived on South Road.
His date of birth is given as 1 Feb 1675 in RI Genealogical Register, Vol. 15, p. 303 ("A Line of Descent from John Spencer of East Greenwich, RI").
The will of Richard Briggs of East Greenwich is dated 9 Mar 1733. It mentions his wife Experience; sons Richard, Francis, John, Caleb, Philip, & Daniel; daughters Sarah Aylesworth, Ann King, Mary Briggs, Audrey Briggs; and grandsons Richard Briggs, Caleb Tarbox, & Richard Matteson.