…”On 24 April 1803, the former Judge-Advocate of Sydney, Lieutenant-Colonel David Collins sailed the Ocean and Calcutta, carrying more than 300 male convicts, officers, wives and children, to found a new settlement at Port Phillip, near modern-day Melbourne. “ Cox, Karin. Settlement New Holland Publishers, 2014. page 12.

…”On October 9th, 1803, His Majesty’s Ship Calcutta, a 56-gun frigate, almost six months out of Spithead, England and six weeks from her last port, after sailing through a day and night of violent tempest into the calm and sunshine of a perfect spring morning, entered Port Phillip Bay, being aided by a fair wind and a favourable tide. Her cargo was a human one, she being entrusted with the transportation of a new settlement consisting of 299 male convicts, 16 convicts’ wives, a few children of the convicts, a detachment of 50 Royal Marines and the Civil Staff. Their Commander, Lieut. Col. Collins, had been empowered to start a new settlement on Port Phillip Bay; a settlement born of panic communicated to the British Government by Governor King’s fear and mistrust of the French scientists who, at that time, were present in Australian waters.”

An Extract from a detailed account of European Settlement 1803   https://nepeanhistoricalsociety.asn.au/history/first-settlement-1803/

Collins named Sullivan Bay after the British Undersecretary of State for War and the Colonies, John Sullivan.

Sullivan Bay proved to be unsuitable, and Collins decided to move to the Derwent where Lieutenant John Bowen had already established a settlement at Risdon. When he arrived in 1804 Collins was dissatisfied with the site. He then chose, and named, Sullivan’s Cove to be the location for Hobart Town.