Question: Batman's Hill was named after which leading member of the Port Phillip Association?

Context articles: Port Phillip Association
John Collicott
Batman's Hill
Bellarine Peninsula
Duck Island (Victoria)
John Batman
St Kilda Beach, Victoria
Fort Queenscliff
Swan Bay
Anthony Cottrell

The Port Phillip Association (originally the "Geelong and Dutigalla Association") was formally formed in June 1835 to settle land in what would become Melbourne, which the association believed had been acquired by John Batman for the association from Wurundjeri elders after he had obtained their marks to a document, which came to be known as Batman's Treaty.
John Thomas Collicott (23 September 1798 – 3 July 1840) was a farmer, auctioneer, postmaster of Hobart and one of the original investors in the Port Phillip Association.
Batman's Hill in Melbourne, Australia was named for the Vandemonian adventurer and grazier John Batman.
 Now removed, the 18 metre high hill was located to the south of today's Collins Street and Southern Cross railway station, and is the site of a steel marker the same height as the original hill.
The Bellarine Peninsula is a peninsula located south-west of Melbourne in Victoria, Australia, surrounded by Port Phillip, Corio Bay and Bass Strait.
 The peninsula, together with the Mornington Peninsula separates Port Phillip from Bass Strait.
 The peninsula itself was originally occupied by Indigenous Australian clans of the Wathaurong nation, prior to European settlement in the early 19th century.
 Early European settlements were initially centred on wheat and grain agriculture, before the area became a popular tourist destination with most visitors arriving by paddle steamer on Port Phillip in the late 19th century.
Duck Island, a small barrier island, lies 1.5 km north of Swan Island and south of Edwards Point in the main entrance to Swan Bay from Port Phillip in southern Victoria, Australia.
 It is part of the Port Phillip Heads Marine National Park and the plants and animals on and around the island are protected, including the critically endangered orange-bellied parrot.
 The island is part of the Swan Bay and Port Phillip Bay Islands Important Bird Area, identified as such by BirdLife International.
John Batman (21 January 18016 May 1839) was an Australian grazier, entrepreneur and explorer.
 He settled in the north-east of the Van Diemen's Land Colony in the 1820s, and later as a leading member of the Port Phillip Association he led an expedition which explored the Port Phillip Bay area on the Australian mainland with a view to establishing a new settlement there.
 He is best known for his role in the founding of the settlement on the Yarra River which became the city of Melbourne, eventual capital of the new Colony of Victoria, and one of Australia's largest and most important cities.
St Kilda Beach is a beach located in St Kilda, Port Phillip, Victoria, Australia, 6 km south from the Melbourne city centre.
 It is Melbourne's most famous beach.
 The beach is a sandy beach about 700 m long between St Kilda Marina and St Kilda Harbour along Jacka Boulevard and St Kilda Esplanade.
 It is located at the north-east corner of Port Phillip and is protected from ocean swell, though still affected by strong westerly winds.
 With Port Phillip Bay being open to the sea, St Kilda Beach is subject to regular tides.
Fort Queenscliff, in Victoria, Australia, dates from 1860 when an open battery was constructed on Shortland's Bluff to defend the entrance to Port Phillip.
 The Fort, which underwent major redevelopment in the late 1870s and 1880s, became the headquarters for an extensive chain of forts around Port Phillip Heads.
 Its garrison included volunteer artillery, engineers, infantry and naval militia, and it was manned as a coastal defence installation continuously from 1883 to 1946.
 The other fortifications and armaments around the Heads were completed by 1891, and together made Port Phillip one of the most heavily defended harbours in the British Empire.
The Swan Bay is a shallow, 30 km2 marine embayment at the eastern end of the Bellarine Peninsula in Port Phillip, Victoria, Australia.
 The township of Queenscliff lies at its southern end, and St Leonards at its northern.
 It is partly separated from Port Phillip by Swan Island, Duck Island and Edwards Point.
 Most of the area is included in the Port Phillip Heads Marine National Park as well as being listed as a wetland of international importance under the Ramsar Convention as part of the Port Phillip Bay (Western Shoreline) and Bellarine Peninsula Ramsar Site.
 The bay is part of the Swan Bay and Port Phillip Bay Islands Important Bird Area, identified as such by BirdLife International because of its importance for orange-bellied parrots, waders and seabirds.
Anthony Cottrell (21 March 1806 – 4 May 1860) was a farmer and one of fifteen investors in the Port Phillip Association.
 The son of Ellen and William Cottrell, a farmer living in the South Esk County of Cornwall, Tasmania.
 He immigrated to Tasmania in 1824 on the 'Cumberland'.
 He was to later befriend John Batman and John Charles Darke, fellow Tasmanian investors and move to Port Phillip on the Yarra River in 1835 as one of the original settlers in what was to become Victoria.
 He later returned to Tasmania.
 He is officially remembered in the name of a hill and an outer western Melbourne suburb, Mount Cottrell, near Melton.