John Laurio Platt was born in 1782 in Basford, Nottingham, England in 1784, the son of a Church of England clergyman. He joined the Navy when he was nineteen and served under Sir Alexander Cochrane and Lord Cochrane, Sir James Yeo during the Anglo-American War of 1812, and Captains Beaver and Parker on the Gold Coast of Africa. He was wounded only once during his fourteen year service. He retired from the Navy in 1814 and was appointed Harbormaster at Heliogoland, where a British garrison was quartered under the command of the Hon. Colonel King. Here he married Miss Rose Ann Dutton, daughter of the British Consul at Cuxhaven. 
Arrival in the Colony
When peace was declared with France the garrison was withdrawn from Heliogoland and the Platt family decided to try their fortunes in the colonies. John and Rosanne Platt with their children Frederick William age 11, Robert age 9 and Jane 71/2 arrived on the Providence in 1822.
He received permission to travel to Newcastle on the Elizabeth Henrietta in February 1822 and took with him a letter to Colonial Morisset at the settlement confirming permission to land and select land. William Dun who selected land at Paterson also made to voyage to Newcastle at this time.
Having brought with him from England letters of introduction, John L. Platt was officially granted 2000 acres in the County of Northumberland on 21 August 1822 (Iron Bark Hill). The land he selected was virgin bush and scrub land and abounded with game of every description. The flats were the haunt of the wild duck and the adjacent bush contained kangaroos, wallabys and bandicoot.  The grant extended from 'The Folly'(Mayfield) to Ironbark Creek  On this land opposite Ash Island, with the use of convict labour, John Platt built a homestead, windmill and farm on a rise east of Iron Bark Creek.
In 1824 fire destroyed Platt's crop and he had difficulties with his workers as well as with the mill he had built. He attempted to mine coal from his land, taking the coal to the harbour in a barge. By 1826 circumstances may have improved for him as his land was sown with wheat down to the river and he had been issued with twenty cows from the Government Store in 1825. He was also in possession of a town allotment in Newcastle. Overseer at Iron Bark Creek in the 1830's was William Wooger Vitnell.
Assigned Convict Servants
Some of the convicts assigned to John Platt at Iron Bark Hill included -
A daughter Mary was born to John and Rosanne in 1823 and Louisa (known as Sally) followed in 1825. Son John Laurio was born c. 1827 and another son William Thompson Platt was born in 1831.
In 1831 misfortune struck the family when two of their sons Robert aged 13 and and John Laurio aged 4 were killed in a fire. Their bodies were buried in the Christ Church burial ground, the Church of which could perhaps be seen in the distance from Platt's farm. By this calamity the family was thrown into a debilitating depression from which it never recovered despite a daughter Roseanne being born the following year. Select here to read correspondence written by John Platt in January 1835 outlining his misfortunes....Transcribed by Gionni Di Gravio 27th June 2006 Cultural Collections (Archives), Auchmuty Library University of Newcastle.
John Laurio Platt died on 17th May 1836 aged 54. Mr. Platt was one of the first emigrant settlers on Hunter's River and was followed to his grave by all the Military, Civil Officers, and gentlemen of the town. (SG)
Rosanne died in October 1836 leaving the remaining children orphaned.
John L. Platt's Children
The children were adopted by Edward C. Close of Morpeth. In 1838 daughter Roseanne Platt died age 5 years of age. She was buried in the Glebe Burial Ground at Maitland.
In 1847 Louisa Platt aged 22 married Edward Close junior in Morpeth and there were great festivities on the occasion with firing of guns and ringing of bells. That evening a huge bonfire was set alight and a procession with tar barrels made round the town.
Another daughter Jane married Rinaldo Schebberas in 1842 and Ann Lydia married John Norton Oxley son of explorer John Oxley. William Platt married Mary Eliza Brooks a daughter of surgeon George Brooks in 1860. Eldest son Frederick William Platt remained in Newcastle. In 1837 he was employed by James Reid at his Stores and an overseer, Mr. Godfrey was employed at the family property.
Australian Agricultural Company
The land that had been granted to John Laurio Platt was sold to the Australian Agricultural Company in 1839 for £6000, however Frederick Platt remained in the district. His house, nine miles from Raymond Terrace, was robbed by four bushrangers who escaped from Newcastle in 1842. Select here to find out more about these bushrangers. By 1843 Frederick was residing in Morpeth.