Despite his imperial claims, Frederick's rule was a major turning point towards the disintegration of central rule in the Empire. While concentrated on establishing a modern, centralized state in Sicily, he was mostly absent from Germany and issued far-reaching privileges to Germany's secular and ecclesiastical princes: in the 1220 Confoederatio cum principibus ecclesiasticis, Frederick gave up a number of regalia in favor of the bishops, among them tariffs, coining, and fortification.
The 1721 Tabriz earthquake occurred on April 26, with an epicenter near the city of Tabriz, Iran. It leveled some three-quarters of the city, The total number of casualties caused by the earthquake is between 8,000 and 250,000; it was most likely approximately 80,000.
On April 26, 1865, in Jackson, Mississippi, Sue Landon Vaughan supposedly decorated the graves of Confederate and Union soldiers. However, the earliest recorded reference to this event did not appear until many years after the fact and is considered a myth. Regardless, mention of the observance is inscribed on a southeast panel of the Confederate Monument in Jackson, erected in 1891.
A Nation of Islam member, was beaten by two New York City police officers. On April 26, Johnson and two other passersby—also Nation of Islam members—saw the officers beating an African-American man with nightsticks. When they attempted to intervene, shouting, "You're not in Alabama ... this is New York!" one of the officers turned on Johnson, beating him so severely that he suffered brain contusions and subdural hemorrhaging. All four African-American men were arrested. Alerted by a witness, Malcolm X and a small group of Muslims went to the police station and demanded to see Johnson. Police initially denied that any Muslims were being held, but when the crowd grew to about five hundred, they allowed Malcolm X to speak with Johnson. Afterward, Malcolm X insisted on arranging for an ambulance to take Johnson to Harlem Hospital.
The Chernobyl disaster was a nuclear accident that occurred on 26 April 1986 at the No. 4 nuclear reactor in the Chernobyl Nuclear Power Plant, near the city of Pripyat in the north of the Ukrainian SSR. It is considered the worst nuclear disaster in history and is one of only two nuclear energy disasters rated at seven—the maximum severity—on the International Nuclear Event Scale, the other being the 2011 Fukushima Daiichi nuclear disaster in Japan.
On April 26, 1988, about 500 people participated in a march organized by the Ukrainian Cultural Club on Kiev's Khreschatyk Street to mark the second anniversary of the Chernobyl nuclear disaster, carrying placards with slogans like "Openness and Democracy to the End".
The Daulatpur–Saturia tornado occurred in Manikganj District, Bangladesh on April 26, 1989. It was the deadliest tornado in Bangladesh's history. There is great uncertainty about the death toll, but estimates indicate that it was devastating and that it killed approximately 1,300 people, which would make it the deadliest tornado in history.
On 26 April 2016, Nokia announced its intent to acquire French connected health device maker Withings for US$191 million. The company was integrated into a new Digital Health unit of Nokia Technologies. Nokia later wrote off the cost of the acquisition and in May 2018 the health unit was sold back to Éric Carreel, a Withings co-founder and former CEO.