For more than a century, Turkey has denied any role in organizing the killing of Armenians in what historians have long accepted as a genocide that started in 1915, as the First World War spread across continents. The Turkish narrative of denial has hinged on the argument that the original documents from postwar military tribunals that convicted the genocide’s planners were nowhere to be found.

Now, Taner Akcam, a Turkish historian at Clark University in Worcester, Mass., who has studied the genocide for decades by piecing together documents from around the world to establish state complicity in the killings, says he has unearthed an original telegram from the trials, in an archive held by the Armenian Patriarchate of Jerusalem.

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“Until recently, the smoking gun was missing,” Akcam said. “This is the smoking gun.” He called his find “an earthquake in our field,” and said he hoped it would remove “the last brick in the denialist wall.”

The story begins in 1915 in an office in the Turkish city of Erzurum, when a high-level official of the Ottoman Empire punched out a telegram in secret code to a colleague in the field, asking for details about the deportations and killings of Armenians in eastern Anatolia, the easternmost part of contemporary Turkey.

Later, a deciphered copy of the telegram helped convict the official, Behaeddin Shakir, for planning what scholars have long acknowledged and Turkey has long denied: the organized killing of up to 1.5 million Armenians by the leaders of the collapsing Ottoman Empire, an atrocity widely recognized as the 20th century’s first genocide.

And then, just like that, most of the original documents and sworn testimony from the trials vanished, leaving researchers to rely mostly on summaries from the official Ottoman newspaper.

Akcam said he had little hope that his new finding would immediately change things, given Turkey’s ossified policy of denial and especially at a time of political turmoil when its president, Recep Tayyip Erdogan, has turned more nationalist.

But Akcam’s life’s work has been to puncture, fact by fact, document by document, the denials of Turkey.

“My firm belief as a Turk is that democracy and human rights in Turkey can only be established by facing history and acknowledging historic wrongdoings,” he said.

He broadened his point to argue that much of the chaos gripping the Middle East today was a result of mistrust between communities over historical wrongdoings that no one is willing to confront.

“The past is not the past in the Middle East,” he said. “This is the biggest obstacle to peace and stability in the Middle East.”

Eric D. Weitz, a history professor at the City College of New York and an expert on the Armenian Genocide, called Akcam “the Sherlock Holmes of Armenian Genocide.”

“He has piled clue upon clue upon clue,” Weitz added.

Turkey has long resisted the word genocide, saying that the suffering of the Armenians had occurred during the chaos of a world war in which Turkish Muslims faced hardship, too.

Turkey also claimed that the Armenians were traitors, and had been planning to join with Russia, then an enemy of the Ottoman Empire.

That position is deeply entwined in Turkish culture — it is standard in school curriculums — and polling has shown that a majority of Turks share the government’s position.

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“My approach is that as much proof as you put in front of denialists, denialists will remain denialists,” said Bedross Der Matossian, a historian at the University of Nebraska and the author of Shattered Dreams of Revolution: From Liberty to Violence in the Late Ottoman Empire.

The genocide is commemorated each year on April 24, the day in 1915 that a group of Armenian notables from Istanbul were rounded up and deported.

It was the start of the enormous killing operation, which involved forced marches into the Syrian Desert, summary executions and rapes.