A by-election for the seat of Polwarth in the Victorian Legislative Assembly was held on 31 October 2015.
 The by-election was triggered by the resignation of Terry Mulder on 3 September 2015.
 Former Premier of Victoria, Denis Napthine, resigned his seat representing the adjacent district of South-West Coast on the same day as Mulder.
 The by-election for South-West Coast was held on the same day.
A by-election for the seat of South-West Coast in the Victorian Legislative Assembly was held on 31 October 2015.
 The by-election was triggered by the resignation of former Premier Denis Napthine on 3 September 2015.
 Former Transport Minister Terry Mulder resigned his seat representing the adjacent district of Polwarth on the same day as Napthine.
 The by-election for Polwarth was held on the same day.
A by-election was held for the Australian House of Representatives seat of Wakefield on 28 August 1909.
 This was triggered by the death of the Speaker of the House, Sir Frederick Holder.
The Wakefield by-election of 1932 was held on 21 April 1932.
 The by-election was held due to the death of the incumbent Conservative MP, George Brown Hillman.
 It was won by the Labour candidate Arthur Greenwood.
The Goyder state by-election, 1974 was a by-election held on 8 June 1974 for the South Australian House of Assembly seat of Goyder.
 This was triggered by the resignation of former Premier and Liberal and Country League/Liberal Movement MHA Steele Hall, who resigned to run for the Australian Senate at the 1974 federal election.
 Created and first contested at the 1970 state election, the seat had been held by the Liberal parties since its creation.
 Hall won the seat at the 1973 state election as an LCL candidate but afterward changed to the LM.
A by-election for the seat of Nedlands in the Legislative Assembly of Western Australia was held on 9 June 2001.
 It was triggered by the resignation of Richard Court, the sitting Liberal member and a former premier, on 27 April 2001.
 The Liberal candidate at the by-election, Sue Walker, retained the seat with 53.4 percent of the two-candidate-preferred (2CP) vote, a negative swing of 1.5 points from the 2001 state election.
 The Greens made the final 2CP count for only the second time in their history (the first being at the 1990 Cottesloe by-election).
The 1954 Wakefield by-election was held on 21 October 1954 after the death of the incumbent Labour MP, Arthur Greenwood.
 It was retained by the Labour candidate Arthur Creech Jones.
Sir Frederick William Holder KCMG (12 May 185023 July 1909) was an Australian politician.
 He was Premier of South Australia from June to October 1892 and again from 1899 to 1901.
 He was a prominent member of the inaugural Parliament of Australia following Federation in 1901, and was the first Speaker of the Australian House of Representatives.
The Norwood state by-election, 1980 was a by-election held on 16 February 1980 for the South Australian House of Assembly seat of Norwood.
 It was triggered when the result in the seat at 1979 state election was overturned by the Court of Disputed Returns.
 Created and first contested at the 1938 state election, the seat had been held by former Premier and Labor MHA Don Dunstan since the 1953 state election until his resignation.
 The subsequent 1979 by-election was won by Labor's Greg Crafter, but he lost to the Liberal Party's Frank Webster at the 1979 state election.
The Barambah state by-election, 1988 was a by-election held on 16 April 1988 for the Queensland Legislative Assembly seat of Barambah, based in the town of Kingaroy.
 The by-election was triggered by the resignation of National MP and former Premier Sir Joh Bjelke-Petersen.
 Until the by-election, the seat had been considered the Nationals' safest seat in Queensland.

Question: The Wakefield by-election in 1909 was held because of the death of the former Premier of what Australian state?
Answer: South Australia