Armenia became independent from the Transcaucasian Democratic Federative Republic on 28 May 1918 as the Democratic Republic of Armenia ( DRA ).

The war was fought from 27 January to 15 May 1918 between the forces of the Social Democrats led by the People's Deputation of Finland, commonly called the " Reds " (, ), and the forces of the non-socialist, conservative-led Senate, commonly called the " Whites " (, ).

Eleven of the 26 were elected Teachta Dála ( members of the Dáil ) in the 1918 general election and 13 in the May 1921 election.

* May 28 is Armenia's first independence, from the Ottoman Empire ;- May 28, 1918.

Baseball was established early on in Cardiff, and one of the earliest of games to be held at the Arms Park was on 18 May 1918.

As Mitchell was about to graduate from the Washington Seminary in 1918, she met and fell in love with another Harvard student, a young army lieutenant, Clifford West Henry, who was chief bayonet instructor at Camp Gordon from May 10 until the time he set sail for France on July 17.

About 50 % of the Australian prisoners were light horsemen including 48 missing believed captured on 1 May 1918 in the Jordan Valley.

However, a decree of 29 May 1918 imposed obligatory military service for men of ages 18 to 40.

May Day demonstration in front of the Marble Palace in 1918

Steiner's father, Johann ( es ) Steiner ( 23 June 1829, Geras or Trabenreith, Irnfritz-Messern and lived Geras Abbey, Waldviertel – 1910, Horn ), left a position as a gamekeeper in the service of Count Hoyos in Geras, northeast Lower Austria to marry one of the Hoyos family's housemaids, Franziska Blie ( 8 May 1834, Horn, Waldviertel – 1918, Horn ), a marriage for which the Count had refused his permission.

Finland was the first republic that declared its independence from Russia in December 1917, and established itself in the ensuing Finnish Civil War from January to May 1918.

In the final year of the war, many predominantly Slovene regiments in the Austro-Hungarian Army staged a mutiny against their military leadership ; the most famous mutiny of Slovene soldiers was the Judenburg Rebellion in May 1918.

The Ottoman Empire broke the treaty after just two months by invading the newly created Democratic Republic of Armenia in May 1918.

# Arizona ( May 24, 1918 )

*** SM UB-74, a Type UB III submarine launched in 1917 and sunk on 26 May 1918

The Federation, however, was short-lived and on 28 May 1918, the Dashnak leader Aram Manukian declared the independence of Armenia.

* May 19 – Alister Williamson, Australian actor ( b. 1918 )

* May 2 – Jack Barry, American television host and producer ( b. 1918 )

* May 16 – The Sedition Act of 1918 is approved by the U. S. Congress.

Coincidentally, all three tornadoes hit on May 20, 1916, 1917, and 1918 respectively.

* May 24 – Elmore James, American blues guitarist ( b. 1918 )

* May 31 – Arthur Olliver, Australian footballer ( b. 1918 )

The National Speleological Society of the USA was later founded in 1941 ( originally formed as the Speleological Society of the District of Columbia on May 6, 1939 ) and the Swiss Society of Speleology created in 1939 in Geneva, but the first speleological institute in the world was founded in 1920 in Cluj-Napoca, Romania, by Emil Racovita, a Romanian biologist, zoologist, speleologist and explorer of Antarctica.

* May 15 – Alexandru Ioan Cuza, first ruler of Romania ( b. 1820 )

* Treaty of 6 May 1918, the treaty between Romania and the Central Powers

* May 20 – The city of Piteşti, now in Romania, is first mentioned.

After the outbreak of World War II, the state was recognised by Slovakia ( 1 June 1940 ), France ( 12 July 1940 ), Romania ( 1 December 1940 ), Bulgaria ( 10 May 1941 ), Finland ( 18 July 1941 ), Denmark ( August 1941 ), Croatia ( 2 August 1941 )— all controlled or influenced by Japan's ally Germany — as well as by the China's Wang Jingwei government ( 30 November 1940 ), Thailand ( 5 August 1941 ) and the Philippines ( 1943 )— all under Japanese control.

In their first European final since 1977 and first ever in a single match, Athletic could not maintain their momentum and deliver a first trophy for 28 years, as they lost 3-0 to Atletico Madrid ( who were inspired by the forward play of Radamel Falcao ), on 9 May in the 2012 UEFA Europa League Final at the Arena Națională in Bucharest, Romania.

" Hermann Oberth was finally awarded his doctorate in physics with the same rocketry paper that he had written before, by the University, Cluj, Romania, under professor Augustin Maior, on May 23, 1923.

* May 15: Constantin Dăscălescu, former prime minister of Romania ( 1982 – 1989 )

Husseini intervened on 13 May 1943, before the meeting with Himmler when he was informed of the holocaust, with the German Foreign Office to block possible transfers of Jews from Bulgaria, Hungary and Romania, after reports reached him that 4, 000 Jewish children accompanied by 500 adults had managed to reach Palestine.

Ion C. Brătianu (; June 2, 1821 – May 16, 1891 ) was one of the major political figures of 19th century Romania.

CFR electric locomotive 060 EA1 242 at Brașov Station, Romania, May 1994

However, with the Ottomans unwilling to definitely accept the loss of Thrace in the east, and an enraged Romania ( on the north ), the decision to open a war against both Greece ( to the south ) and Serbia ( to the west ), was a rather adventurous one, since in May the Ottoman Empire had urgently requested a German mission to reorganize the Ottoman army.

In April – May 1944, the Romanian forces led by General Mihai Racoviţǎ, together with elements of the German Eighth Army were responsible for defending northern Romania during the initial Soviet attempt to invade Romania, and took part in the Battles of Târgu Frumos.

On 29 May 1944, Khazanov claimed Hartmann reported three La-5s shot down over Roman, Romania.

In 1981, after completing the flight, he received the awards of Hero of the Socialist Republic of Romania and Hero of the Soviet Union ( 22 May 1981 ) and the medal " Golden Star ".

From May 2004 until August 2005 Prunariu was the itinerary Ambassador Extraordinary and Plenipotentiary of Romania to the Russian Federation.

Houseman was born in Bucharest, Romania in 1902, the son of May ( née Davies ) and Georges Haussmann, who ran a grain business.

In May 1918, Romania yielded to German demands and negotiated the Bucharest Treaty, an effective armistice.

On 7 – 9 May 1999, Pope John Paul II visited Romania.

The Social Democratic Party governed Romania from 1992 to 1996, also from 2000 to 2004 and currently does so since 7 May 2012 alongside allied-parties in the Social Liberal Union.

On May 9, 1877, it was through Kogălniceanu's speech in Parliament that Romania acknowledged she was discarding Ottoman suzerainty.

Ion Ghica (; August 12, 1816 – May 7, 1897 ) was a Romanian revolutionary, mathematician, diplomat and twice Prime Minister of Romania ( between 1866 and 1867, and between 1870 and 1871 ).

Hateley came on as a substitute for Mariner in a friendly victory over East Germany in September 1984, before Mariner picked up his 35th and final cap in a goalless draw against Romania in May 1985, a qualifier for the 1986 World Cup.