On This Day - What happened 10 April

Aybak was assassinated on 10 April 1257, possibly on the orders of Shajar al-Durr, who was assassinated a week later. Their deaths left a relative power vacuum in Egypt, with Aybak's teenage son, al-Mansur Ali, as heir to the sultanate.

In the early morning of 10 April, leading elements of the Austrian army crossed the Inn River and invaded Bavaria.

The 1815 eruption of Mount Tambora was the most powerful in human recorded history, with a Volcanic Explosivity Index (VEI) of 7. Although its eruption reached a violent climax on 10 April 1815, increased steaming and small phreatic eruptions occurred during the next six months to three years. Tanguy pointed out that there may have been additional victims on Bali and East Java because of famine and disease. Their estimate was 11,000 Oppenheimer wrote that there were at least 71,000 deaths in total. Reid has estimated that 100,000 people on Sumbawa, Bali, and other locations died from the direct and indirect effects of the eruption.

Titanic's maiden voyage began on Wednesday, 10 April 1912. Following the embarkation of the crew the passengers began arriving at 9:30 a.m., when the London and South Western Railway's boat train from London Waterloo station reached Southampton Terminus railway station on the quayside, alongside Titanic's berth.

Hitler lost to Hindenburg, this election established Hitler as a strong force in German politics.

In 1940 the entire royal family had to flee Oslo because of the German invasion. It was deemed safer for the family to split up. The King and Crown Prince Olav would remain in Norway and the Crown Princess was to make her way to Sweden with the three children. The latter party reached Sweden on the night of 10 April. but although Crown Princess Märtha was Swedish-born, they encountered problems at the border station.

On 10 April 1941, Slavko Kvaternik proclaimed the Independent State of Croatia, and Tito responded by forming a Military Committee within the Central Committee of the Yugoslav Communist Party.

The Siege of Tobruk lasted for 241 days in 1941, after Axis forces advanced through Cyrenaica from El Agheila in Operation Sonnenblume against Allied forces in Libya, during the Western Desert Campaign (1940–1943) of the Second World War. The siege diverted Axis troops from the frontier and the Tobruk garrison repulsed several Axis attacks.

On Her Majesty's Secret Service is the tenth novel (and eleventh book) in Ian Fleming's James Bond series, first published in the UK by Jonathan Cape on 1 April 1963.

McCartney was unhappy with the producer's approach and particularly dissatisfied with the lavish orchestration on "The Long and Winding Road", which involved a fourteen-voice choir and 36-piece instrumental ensemble. McCartney's demands that the alterations to the song be reverted were ignored, and he publicly announced his departure from the band on 10 April 1970, a week before the release of his first, self-titled solo album.

From early 1983–1984, Iran launched a series of four Valfajr (Dawn) Operations (that eventually numbered to 10). During Operation Dawn-1, in early February 1983, 50,000 Iranian forces attacked westward from Dezful and were confronted by 55,000 Iraqi forces. The Iranian objective was to cut off the road from Basra to Baghdad in the central sector.

Phillip Burton died in 1983 and was succeeded by his wife, Sala. In late 1986, Sala became ill with cancer and decided not to run for reelection in 1988. She picked Pelosi as her designated successor, guaranteeing her the support of the Burtons' contacts.

On 10–11 April 1994, UNPROFOR called in air strikes to protect the Goražde safe area, resulting in the bombing of a Serbian military command outpost near Goražde by two US F-16 jets.

She was subsequently elected to replace Schäuble, becoming the first female leader of a German party on 10 April 2000. Her election surprised many observers, as her personality offered a contrast to the party she had been elected to lead; Merkel is a centrist Protestant originating from predominantly Protestant northern Germany, while the CDU is a male-dominated, socially conservative party with strongholds in western and southern Germany, and its Bavarian sister party, the CSU, has deep Catholic roots.

On 10 April 2005, Kasparov was in Moscow at a promotional event when he was struck over the head with a chessboard he had just signed. The assailant was reported to have said "I admired you as a chess player, but you gave that up for politics" immediately before the attack.

Though Major-General Sir Sebastian Roberts, General Officer Commanding the Household Division, had said William's deployment was possible, the Prince's position as second-in-line to the throne and the convention of ministers advising against placing that person into dangerous situations cast doubts on William's chances of seeing combat. These doubts increased after Prince Harry's deployment was canceled in 2007 due to "specific threats". William, instead, went on to train in the Royal Navy and Royal Air Force, obtaining his commission as a sub-lieutenant in the former and flying officer in the latter—both broadly equivalent to the army rank of lieutenant. After completing his training, William undertook an attachment with the Royal Air Force, undergoing an intensive, four-month training course at RAF Cranwell. Upon completing the course on 11 April 2008, he was presented with his RAF wings by his father, who had received his own wings after training at Cranwell. During this secondment, William flew to Afghanistan in a C-17 Globemaster that repatriated the body of Trooper Robert Pearson.

Following the Port Said Stadium riot on 1 February 2012, the Egyptian Premier League was suspended, and on 10 March 2012, the Egyptian Football Association announced their decision to cancel the remainder of the season. Swiss Super League club Basel had been monitoring Salah for some time, so following the Egyptian Premier League suspension, the club organised a friendly match with the Egypt U-23 team. The match took place on 16 March at the Stadion Rankhof in Basel, and despite only playing the second half, Salah scored twice, helping the Egyptians to a 4–3 win. Basel subsequently invited Salah to remain in the city for a week's training. On 10 April 2012, it was announced that Salah had signed for Basel on a four-year contract starting from 15 June 2012.

On 10 April, 2013, Arnault announced that he had decided to abandon his application for Belgian citizenship, saying he did not want the move to be misinterpreted as a measure of tax evasion at a time when France faced economic and social challenges.

The bitcoin price rose to $259 on 10 April, but then crashed by 83% to $45 over the next three days.

On April 10, 2013, Bryant became the first player in NBA history to get 47 points, eight rebounds, five assists, four blocks, and three steals in an NBA game.

Demosistō, a political party mainly led by the former student leaders such as Joshua Wong and Nathan Law in the 2014 Occupy protests established on 10 April 2016, advocated a referendum to determine Hong Kong's sovereignty after 2047, when the "One Country, Two Systems" principle as promised in the Sino-British Joint Declaration and the Hong Kong Basic Law is supposed to expire.

In 2016, Hart co-hosted the 2016 MTV Movie Awards with Dwayne Johnson.

On April 10 and April 11, 2018, Zuckerberg began testifying before the United States Senate Committee on Commerce, Science, and Transportation regarding the usage of personal data by Facebook in relation to the Facebook–Cambridge Analytica data breach.

Barca had a sad night losing 3–0 to Roma. Goals from Džeko, De Rossi, and Manolas allowed the Italians to turn around a three-goal deficit and qualify for the semi-finals on the away goals rule.

On 10 April 2019, late-night talks in Brussels resulted in a further extension, to 31 October 2019; Theresa May had again requested an extension only until 30 June.

Bitcoin is back above $60,000 as Coinbase gets ready for a public debut.

The English classical scholar, Benjamin Heath, was born in the UK.

Baslio da Gama was born in the Colony of Brazil in 1741.

Duke Sforza was captured by France.

At the age of 41 or 42, Michael Tarchaniota Marullus drowns in full armor, along with his horse, while travelling to join a battle in the Republic of Florence.

The founder of the town of Rimouski, René Lepage de Sainte-Claire, was born in Ouanne, Burgundy, France.