Piet Aalberse Sr.

His Excellency Piet Aalberse
Aalberse in 1918
Member of the Council of State
In office 10 November 1937 – 1 April 1946
Vice President	Frans Beelaerts van Blokland
Speaker of the House of Representatives
In office 7 May 1936 – 9 November 1937
Preceded by	Charles Ruijs de Beerenbrouck
Succeeded by	Josef van Schaik
Leader of the Roman Catholic State Party
In office 31 May 1933 – 11 November 1937
Preceded by	Charles Ruijs de Beerenbrouck
Succeeded by	Laurentius Nicolaas Deckers
Parliamentary leader in the House of Representatives
In office 15 September 1931 – 7 May 1936
Preceded by	Willem Hubert Nolens
Succeeded by	Carel Goseling
Minister of Labour, Commerce and Industry
In office 1 January 1923 – 4 August 1925
Prime Minister	Charles Ruijs de Beerenbrouck
Preceded by	Charles Ruijs de Beerenbrouck as Minister of Agriculture, Commerce and Industry Himself as Minister of Labour
Succeeded by	Dionysius Koolen
Minister of Labour
In office 25 September 1918 – 1 January 1923
Prime Minister	Charles Ruijs de Beerenbrouck
Preceded by	Office established
Succeeded by	Himself as Minister of Labour, Commerce and Industry
Member of the House of Representatives
In office 15 September 1925 – 9 November 1937
In office 24 February 1903 – 21 June 1916
Personal details
Born	Petrus Josephus Mattheus Aalberse (1871-03-27)27 March 1871 Leiden, Netherlands
Died	5 July 1948(1948-07-05) (aged 77) The Hague, Netherlands
Political party	Catholic People's Party (from 1945)
Other political affiliations	Roman Catholic State Party (1926–1945) General League of Roman Catholic Caucuses (until 1926)
Spouse	Elisabeth Schmier ​ (m. 1898)​
Children	Piet Aalberse Jr. (1910–1989) and 7 daughters
Alma mater	Leiden University (Bachelor of Laws, Master of Laws)
Occupation	Politician · Civil servant · Jurist · Lawyer · Prosecutor · Researcher · Academic administrator · Nonprofit director · Editor · Author · Professor

Petrus Josephus Mattheus "Piet" Aalberse Sr. (27 March 1871 – 5 July 1948) was a Dutch politician of the General League of Roman Catholic Caucuses, later the Roman Catholic State Party (RKSP) and later co-founder of the Catholic People's Party (KVP) and jurist. He was granted the honorary title of Minister of State on 31 December 1934.^[1]

Alberse applied at the Leiden University in June 1891, majoring in Law and obtaining a Bachelor of Laws degree in July 1893. He worked as a student researcher before graduating with a Master of Laws degree in July 1897. Aalberse worked as a lawyer in Leiden from August 1897 until April 1901. Aalberse also worked as editor of the Catholic newspapers De Tijd and the De Maasbode from November 1898 until 25 September 1918. Aalberse served on the municipal council of Leiden from September 1899 until September 1918, and served as an alderman in Leiden from September 1901 until February 1903. Aalberse became a member of the House of Representatives after the death of Herman Schaepman, serving from 24 February until 21 June 1916. Aalberse worked as a professor of Administrative law and Labour law at the Delft Institute of Technology from 21 June 1916 until 25 September 1918. After the 1918 general election, Aalberse was appointed as the first Minister of Labour in the first Ruijs de Beerenbrouck cabinet, taking office on 25 September 1918. After the 1922 general election Aalberse continued as Minister of Labour in the second Ruijs de Beerenbrouck cabinet, taking office on 18 September 1922. On 1 January 1923, the Ministry of Labour and the Ministry of Agriculture, Commerce and Industry were combined to form the Ministry of Labour, Commerce and Industry, with Aalberse continuing in the post as the newly renamed Minister of Labour, Commerce and Industry. After the 1925 general election, Aalberse was not given a cabinet post in the new cabinet, the Cabinet Ruijs de Beerenbrouck II was replaced by the Cabinet Colijn I on 4 August 1925. Aalberse subsequently returned to the House of Representatives as a frontbencher, taking office on 15 September 1925. After the leader of the Roman Catholic State Party and Parliamentary leader of the Roman Catholic State Party in the House of Representatives Willem Hubert Nolens announced his retirement from national politics, Charles Ruijs de Beerenbrouck was nominated as his successor as leader and Aalberse was selected as Parliamentary leader in the House of Representatives, taking office on 15 September 1931. After the leader of the Roman Catholic State Party Charles Ruijs de Beerenbrouck was elected as Speaker of the House of Representatives he subsequently stepped down as leader in favor of Aalberse on 31 May 1933.