The crash of his ambitious Lawson L-4 " Midnight Liner " during its trial flight takeoff on May 8, 1921, ended his best chance for commercial aviation success.

Andrei Dmitrievich Sakharov (; May 21, 1921 – December 14, 1989 ) was a Soviet nuclear physicist, dissident and human rights activist.

Sakharov was born in Moscow on May 21, 1921.

‘ Abdu ’ l-Bahá (‎; 23 May 1844 – 28 November 1921 ), born ‘ Abbás Effendí, was the eldest son of Bahá ' u ' lláh, the founder of the Bahá ' í Faith.

The earliest of these was a casual reference on May 3, 1921:

On 14 May 1921, the Politburo, chaired by Lenin, passed a motion " broadening the rights of the in relation to the use of the penalty.

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

In May 1921, the IRA in Dublin attacked and burned the The Custom House.

One of the strongest critics of the Black and Tans was King George V who in May 1921 told Lady Margery Greenwood that ‘ he hated the idea of the ‘ Black and Tans ”.’

In May 1921 ibn Saud's Wahhabi Bedouins of Nejd attacked a Kuwaiti detachment in southern Kuwait, forcing its retreat.

Karel van het Reve ( 19 May 1921, Amsterdam – 4 March 1999, Amsterdam ) was a Dutch writer, translator and literary historian, teaching and writing on Russian literature.

His mother, Harriet May Norton, a 1921 graduate of Oberlin College, was the daughter of the Rev.

In May 1921, the Afghans and the Soviets signed a Treaty of Friendship, Afghanistan's first international agreement since gaining full independence in 1919.

The ballet's premiere in Paris on 17 May 1921 was a huge success and was greeted with great admiration by an audience that included Jean Cocteau, Igor Stravinsky and Maurice Ravel.

The Tulsa Race Riot was a large-scale racially motivated conflict on May 31 and June 1, 1921, in which whites attacked the black community of Tulsa, Oklahoma.

Previously, on May 21, 1921 President Harding had signed emergency legislation that put tariffs on select foreign inputs.

On May 12, 1921, just two months into Harding's presidency, violence was initiated near Matewan, West Virginia, between private detectives, on behalf of the Stone Mountain Coal Company, and United Mine Workers union members who had been fired from their jobs and were being evicted from company-owned housing.

The Per Centum Act of 1921 signed by President Harding on May 19, 1921 severely reduced the amount of immigration into the U. S. to 3 % of a country's represented population based on the 1910 census.

** Franco-Turkish War ( May 1920 – October 1921 )

* May 29 – Arthur Mold, English cricketer ( d. 1921 )

* May 2 – Caryl Chessman, American criminal ( b. 1921 )

* May 28 – George Ashlin, Irish Architect ( d. 1921 )

* May 31 – Julius Richard Petri, German bacteriologist ( d. 1921 )

* May 23 – ` Abdu ' l-Bahá, Persian Bahá ' í religious leader ( d. 1921 )

It was under these conditions that Pope Gregory XI, who in January, 1377, had gone from Avignon to Rome, sent on 22 May five copies of his bull against Wycliffe, dispatching one to the Archbishop of Canterbury, and the others to the Bishop of London, King Edward III, the Chancellor, and the university ; among the enclosures were 18 theses of his, which were denounced as erroneous and dangerous to Church and State.

In May 1840, the Bishop of Nice sent Paganini a local parish priest to perform the Last Rites.

Pope Benedict XV appointed Pacelli as nuncio to Bavaria on 23 April 1917, consecrating him as titular Bishop of Sardis and immediately elevating him to archbishop in the Sistine Chapel on 13 May 1917.

After Constantine ’ s death on 9 April 715, Gregory was elected pope, and was consecrated as Bishop of Rome on 19 May 715.

Pope Saint Stephen I served as Bishop of Rome from 12 May 254 to 2 August 257.

On November 30, 1993, Bishop Pivarunas conferred episcopal consecration to Father Daniel Dolan in Cincinnati, Ohio, and on May 11, 1999, he consecrated Martin Davila for the Union Catolica Treno to succeed Bishop Carmona.

* May 4 – Arthur Lake, Bishop of Bath and Wells, English bishop and Bible translator ( b. 1569 )

* May 18 – George Smalridge, English Bishop of Bristol ( d. 1719 )

* May 8 – Beilby Porteus, Bishop of London and abolitionist ( d. 1809 )

* May 15 – William Walcher, Bishop of Durham

* May 18 – Nicholas Longespee, Bishop of Salisbury

* May 25 – Aldhelm, Bishop of Sherborne

On 22 May 1073 he received presbyetral ordination, and on 30 June was ordained as a bishop in his position as Bishop of Rome.

* May 9 – John Drokensford, Bishop of Bath and Wells

* May 7 – Remigius de Fécamp, first Bishop of Lincoln

He made his uncle Giovanni Carlo Bandi, Bishop of Imola in 1752, and a member of the curia, cardinal in the consistory on 29 May 1775, but did not proffer any other members of his family.

* May 9 – Alexandria's patriarch Bishop Alexander dies and is succeeded by his deacon Athanasius.

In the aftermath of East Timorese independence on 20 May 2002, the pressure of events and the ongoing stress he endured began to show their effects on Bishop Belo's health.

* Lesser Feasts and Commemorations on the Lutheran liturgical calendar include Anthony of Egypt on January 17, Henry, Bishop of Uppsala, martyr Henry of Uppsala on January 19, Timothy, Titus and Silas, missionaries St Timothy, St Titus and St Silas Day on January 26, Ansgar, Bishop of Hamburg, missionary to Denmark and Sweden St Ansgar on February 3, Cyril, monk and Methodius, bishop, missionaries to the Slavs St Cyril and St Methodius on February 14, Gregory the Great on March 12, St Patrick on March 17, Olavus Petri, priest and Laurentius Petri, Bishop of Uppsala, on April 19, St Anselm on April 21, Catherine of Siena on April 29, St Athanasius on May 2, St Monica on May 4, Eric IX of Sweden on May 18, St Boniface on June 5, Basil the Great, Gregory of Nyssa and Gregory of Nazianzus on June 14, Benedict of Nursia on July 11, Birgitta of Sweden on July 23, St Anne, Mother of Mary on July 26, St Dominic on August 8, Augustine of Hippo on August 28, St Cyprian on September 16, Teresa of Avila on October 15, Martin de Porres on November 3, Martin of Tours on November 11, Elizabeth of Hungary on November 17, St Lucy on December 13.