* May 23 – Jules Dumont d ' Urville, French explorer ( d. 1842 )

* May 8 – Jules Dumont d ' Urville, French explorer ( b. 1790 )

* Kee-too-way-how (‘ Sounding With Flying Wings ’, better known as Alexander Cayen dit Boudreau, Chief of the Parklands or Willow Cree at Muskeg Lake, born 1834 St. Boniface, Manitoba, son of Pierre Narcisse Cayen dit Boudreau and Adelaide Catherine Arcand (‘ Kaseweetin ’), though he was of Métis descent he became chief of the Willow Cree and the Métis, who were living with the Cree, brother of Petequakey (‘ Isidore Cayen dit Boudreau ’), lived along Duck Lake, signed 1876 Treaty 6 and settled in a reserve at Muskeg Lake-that was later named after his brother Petequakey-but left the reserve in 1880 and lived again in the following years close to St. Laurent de Grandin mission, played a prominent role during the Northwest Rebellion of 1885 in which he participated in every battle, served also as an emissary of the Métis leader Gabriel Dumont to ask the Assiniboine for support, on 23 May 1885 he also submitted the declaration of surrender of Pitikwahanapiwiyin (' Poundmaker ') to General Middleton, was captured on the 1st June 1885, in the subsequent trial of Kee-too-way-how at Regina, Louis Cochin testified that he and the carters in the camp of Pitikwahanapiwiyin survived only thanks to the intercession by Kee-way-too-how and its people, despite the positive testimony, he was on 14 August 1885 sentenced to imprisonment for seven years for his involvement in the Métis rebellion, died 1886 ).

Jules Sébastien César Dumont d ' Urville ( 23 May 1790 – 8 May 1842 ) was a French explorer, naval officer and rear admiral, who explored the south and western Pacific, Australia, New Zealand and Antarctica.

Some annual events conducted n the borough include Dumont Day, held in early September, Octoberfest, held in early October, The Dumont Winter Festival, held in December and an annual Memorial Day Parade and celebration held in May.

* The aviator gives his name to a boutique Aircraft Management and Consultancy Company, Santos Dumont, founded in May 2004.

This was shortly followed by the Blériot XII, a high-wing two-seater monoplane first flown on 21 May, and for a while Blériot concentrated on flying this machine, flying it with a passenger on 2 July, and on 12 July making the world's first flight with two passengers, one of whom was Santos Dumont.

On May 20, 1901, André Dumont found commercial-grade coal in neighbouring As.

Gabriel Dumont ( December 1837 – May 19, 1906 ) was a leader of the Métis people of what is now Western Canada.

In May 2006, the ADQ held a general council () in Granby, where Dumont brought up the subject of having the current federal Conservative government broach the subject of a new round of constitutional talks in order to get Quebec to finally sign the Constitution.

* May 19-Mario Dumont, politician

* May 1-Fernand Dumont, sociologist, philosopher, theologian and poet ( born 1927 )

Mario Dumont ( born May 19, 1970 in Saint-Georges-de-Cacouna, Quebec ) is a television personality and former politician in Quebec, Canada.

* May 8-Jules Dumont d ' Urville ( born 1790 ), explorer.

* May 23-Jules Dumont d ' Urville, French explorer ( died 1842 )

A contemporary memoir by Dumont de Montigny mistakenly reported this battle as taking place on May 20, 1736, leading to confusion in many later accounts.

* 3 May 1963: a Cruzeiro do Sul Convair 340-59 registration PP-CDW flying from São Paulo-Congonhas to Rio de Janeiro-Santos Dumont had to return to São Paulo after no.

* 3 May 1934: a Syndicato Condor Junkers W-34 registration PP-CAR crashed during landing procedures at Rio de Janeiro-Santos Dumont.

* 3 May 1963: a Cruzeiro do Sul Convair 340-59 registration PP-CDW flying from São Paulo-Congonhas to Rio de Janeiro-Santos Dumont had to return to São Paulo after its no. 2 engine caught fire.

Jean Dumont Baron de Carlscroon ( January 13, 1667 – May 13, 1727 ) was a French publisher.

* May 9 – May 12 – Battle of Batoche: Canadian government forces inflict a decisive defeat on Métis rebels.

* May 9-May 12-North-West Rebellion: Battle of Batoche the Métis are defeated in battle

* May 25-Malcolm Norris, Métis leader ( d. 1967 )

Fought from 9 May to 12 May 1885 at the ad hoc Provisional Government of Saskatchewan capital of Batoche, the greater numbers and superior firepower of Middleton's force could not be successfully countered by the Métis ( as had happened at Fish Creek ), and the town was eventually captured.

The defeat of the Métis led to the surrender of Louis Riel on 15 May and the collapse of the Provisional Government.

However, due to the difficulty of the terrain and Middleton's penchant for prudence, his force lagged behind schedule, and when the Northcote appeared adjacent to the town on 9 May it was spotted by Métis who had not yet come under artillery fire.

By 12 May, Métis defences were in poor shape.

Pierre Guillaume Sayer ( c. 1801 – after May 1849 ) was a Métis fur trader whose trial was a turning point in the ending of the Hudson's Bay Company's ( HBC ) monopoly of the fur trade in North America.

Riel emerged as a Métis leader in the defence of Guillaume Sayer in his trial in May 1849.

Washington evidently was anxious for Morgan to be cautious as well as aggressive, for on May 17th, 18th and 20th he admonished the leader of the riflemen-rangers to be on the alert.

This leader must be a man who lives above illusions that heretofore have shaped the foreign policy of the United States, namely that Russia will agree to a reunited Germany, that the East German government does not exist, that events in Japan in June 1960 were Communist-inspired, that the true government of China is in Formosa, that Mao was the evil influence behind Khrushchev at the Summit Conference in Paris in May 1960, and that either China or Russia wants or expects war.

He was one of the seven cardinals who, in May 1408, deserted Pope Gregory XII, and, with those following Antipope Benedict XIII from Avignon, convened the Council of Pisa, of which Cossa became the leader.

The main weapons of assassination chosen organised the successful assassination of King Alexander I of Serbia and his consort Draga ; he confirmed that Captain Dragutin Dimitrijevic, who had personally led the group of Army officers who killed the royal couple in the Old Palace at Belgrade on the night of 28 / 29 May 1903 ( Old Style ), was also the Black Hand's leader.

In May 1947, flight leader Lt. Cmdr.

Following the resignation of Díaz from the presidency on the 25th May 1911 after the signing of the Treaty of Ciudad Juárez, Madero became the highest political leader of the country.

Frederik Willem de Klerk ( born 18 March 1936 ), often known as F. W. de Klerk, was the seventh and last State President of apartheid-era South Africa, serving from September 1989 to May 1994. de Klerk was also leader of the National Party ( which later became the New National Party ) from February 1989 to September 1997.

On 6 May 2004, Turkey's Prime Minister Recep Tayyip Erdoğan became the first Turkish leader to visit Greece in fifty years.

Sometimes a head of state assumes office as a state becomes legal and political reality, before a formal title for the highest office is determined ; thus in the since 1 January 1960 independent republic Cameroon ( Cameroun, a former French colony ), the first President, Ahmadou Babatoura Ahidjo, was at first not styled président but ' merely ' known as Chef d ' état ( literal French for ' Head of State ') until 5 May 1960 ; in Uganda, military coup leader since 25 January 1971 Idi Amin was formally styled military head of State till 21 February 1971, only from then on regular ( but unconstitutional, not elected ) President.

Following the May 2012 legislative election where the New Democracy party became the largest party in the Hellenic Parliament, Samaras, leader of ND, was asked by Greek President Karolos Papoulias to try to form a government.

She was launched by Holt's widow Dame Zara at the Todd Shipyards in Los Angeles on 3 May 1969, and was the first American warship to bear the name of a foreign leader.

Eamon Ryan was elected as the new party leader, over party colleagues Phil Kearney and Cllr Malcolm Noonan in a postal ballot election of party members in May 2011.

Josef Antonius Heinrich Terboven ( 23 May 1898 – 8 May 1945 ) was a Nazi leader, best known as the Reichskommissar for Norway during the German occupation of Norway.

Joseph Gurney Cannon ( May 7, 1836 – November 12, 1926 ) was a United States politician from Illinois and leader of the Republican Party.

Jawaharlal Nehru (, 14 November 1889 – 27 May 1964 ), often referred to as Panditji, was an Indian politician and statesman, a leader in the Indian Independence Movement, and the first Prime Minister of independent India.

They congregated at Northampton in May and renounced their feudal ties to John, appointing Robert fitz Walter as their military leader.

Along with King John, who was elected leader of the crusade, the fleets sailed to Egypt and besieged Damietta at the mouth of the Nile in May.

Karl Bernhardovic Radek () ( 31 October 1885 – 19 May 1939 ) was a socialist active in the Polish and German movements before World War I and an international Communist leader after the Russian Revolution.

When party leader Sun Yat-Sen died in May 1925, he was succeeded by a rightist, Chiang Kai-shek ( 1887 – 1977 ), who was opposed to Mao's involvement.

As a result, Labour had moved ahead of the Tories in the opinion polls, and in the aftermath of Foot's election as leader opinion polls showed a double-digit lead for Labour, boosting his hopes of becoming prime minister by the time of the next general election, which had to be held by May 1984.

John Hewson was replaced as Liberal party leader by Alexander Downer after being defeated at a leadership spill in May 1994.

The, David Cameron, leader of the Conservative Party, was appointed by the Queen on 11 May 2010.

In the following May 2010 UK general election, the Trade Unionist and Socialist Coalition, launched in January 2010 and backed by Bob Crow, the leader of the National Union of Rail, Maritime and Transport Workers union ( RMT ), other union leaders and the Socialist Party among other socialist groups, stood against Labour in 40 constituencies.

Qaddafi then strongly supported Sudanese opposition leader Sadiq al Mahdi, who became prime minister on May 6, 1986.