Pompey Siddon was born in the bush at Milijiti, his country, near Noonkanbah. His Aboriginal name was Jirtin and skin name was Jawanti.
When he was young, Walmajarri people living at Milijiti killed and ate sheep from Noonkanbah Station. Siddon and his family were worried about the police finding out so they walked to Yakanarra and lived at a big rockhole called Pulany. The police tracked them to Pulan, chained up all the men and made them walk to Noonkanbah. They beat his father and left him in the bush, where he died.
Siddon walked to Cherrabun and lived around the waterholes, walking around Cherrabun, Christmas Creek and Noonkanbah. Later he leant how to work with cattle and about riding horses and was the manager at Paradise outstation for a long time. When he finished working, he moved to Junjuwa Community (at Fitzroy Crossing) and then to Mindi Rardi, another town community.
Siddon first exhibited work in the Mangkaja Arts group show, Karrayili at Tandanya, Adelaide, 1991. Later his work was included in Images of Power: Aboriginal Art of the Kimberley, National Gallery of Victoria, Melbourne, 1993 and in This is my country, a Mangkaja Arts exhibition held at Artspace, Claremont for Festival of Perth in 1994.