From the Maitland Mercury report:
Morpeth man Jim Chambers lived in an old cottage on the site of today’s Morpeth Pharmacy. Chambers trained racehorses, which were stabled in a large shed in the backyard. His best horse Posinatus won the Melbourne Cup in 1913. When Posinatus retired from racing he was given to Father Corcoran to ride around his parish at Morpeth.
Full article by Rebecca Berry available at Maitland Mercury, 29 Oct, 2010.