Ion Llewellyn Idriess (20 September 18896 June 1979) was a prolific and influential Australian author. He wrote more than 50 books over 43 years between 1927 and 1969 – an average of one book every 10 months, and twice published three books in one year (1932 and 1940). His first book was Madman's Island, published in 1927 at the age of 38, and his last was written at the age of 79. Called Challenge of the North, it told of Idriess's ideas for developing the north of Australia. Two of his works, The Cattle King (1936) and Flynn of the Inland (1932) had more than forty reprintings. Biography Early years Idriess was born in Waverley, a suburb of Sydney, to Juliette Windeyer (who had been born as Juliette Edmunds in 1865 at Binalong) and Walter Owen Idriess (a sheriff's officer born in 1862, who had emigrated from Dolgellau, in Wales). At birth Ion Idriess's name was registered as "Ion Windeyer", although he never seems to have used this name. From his late teens, he worked in rural New South Wales, particularly in the Narrabri and Moree districts. He travelled extensively around the state, working in a variety of itinerant jobs including employment as a rabbit poisoner, boundary rider, drover, prospecting for gold as well as harvesting sandalwood. He also worked as a shearer and dingo shooter. While working as an opal miner at Lightning Ridge in about 1910, he wrote short pieces for The Bulletin about life on the opal fields. He later headed north, working in several tin mines around Cairns and Cooktown including his own claim. In 1913 he moved to Cape York Peninsula, where he lived with an Aboriginal clan, learning their customs and lifestyle. Military service With the outbreak of war, in 1914 he returned to Townsville and enlisted in the 5th Light Horse Regiment, AIF, as a trooper. He saw action in Palestine, Sinai and Turkey, being wounded at Beersheba and Gallipoli – where he acted as spotter for noted sniper Billy Sing. After returning to Australia and recuperating from his wounds, he travelled to remote Cape York, and worked with pearlers and missionaries in the Torres Strait islands and Papua New Guinea where he worked as a gold miner. Other ventures included buffalo shooting in the Northern Territory, and journeys to Central and Western Australia. Career as a writer In 1928 Idriess settled in