Jennings was born at
Newry,
Ireland, the son of Francis Jennings. He soon became a shopkeeper, and then moved into quartz-crushing and bought a large pastoral property on the
Murrumbidgee River. In 1857 he became a magistrate. He ran unsuccessfully for the
Crowlands in the
Victorian Legislative Assembly in 1859 and then became chairman of the St Arnaud Council. In 1863, he married Mary Ann Shanahan and moved to Warbreccan near
Deniliquin. ==Political career==