Can any one give me the history on these people. Looking for Barbara Mertz father and Family born about 1802 A Reuven Singer wrote John Jacob Martz known to have died in Augusta Twp, Northumberland Co, PA in 1803 and is buried in the Old Cemetery in Sunbury PA. In the census of 1800, Jacob would have been 59 On the other hand, I have a fairly comprehensive list of his children and the last male born was in 1777 (John Jacob Jr.). He would have been 23 in 1800.