His grandson and training partner James said in a statement the 87-year-old died in his sleep in the early hours of Sunday morning.
"James Bartholomew Cummings, OAM, passed away peacefully in his sleep in the early hours of this morning, Sunday the 30th of August 2015, in his homestead at Princes Farm, Castlereagh," James Cummings said.
"His final moments were spent with his family and wife of 61 years, Valmae, with whom he celebrated their anniversary on Friday.
"For Bart, aged 87, this was a fitting end. A husband, father, grandfather and great-grandfather; a master trainer and a larger than life figure.
"We will miss you."
Cummings had been in ill health for some time and rarely ventured from his farm in recent years.
