In one of the darkest chapters of African colonial history, tens of thousands of Herero and Nama people were killed from 1904 to 1908.
Germany and Namibia have been in talks for the past two years about a joint declaration on the massacres.
The tribes filed their class-action lawsuit in January seeking compensation for "incalculable damages" and demanding that they be included in the negotiations between the two countries.
"When I heard that she said the hearing can take place -- that was the greatest success we have achieved. This is the sign that we are the winners," said Ida Hoffmann, 69, a Namibian MP and Nama representative.
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While some German officials have acknowledged that a genocide occurred, the government has fallen short of an official declaration.
And Berlin repeatedly refused to pay direct reparations, saying that its development aid worth hundreds of millions of euros since Namibia's independence from South Africa in 1990 was "for the benefit of all Namibians."
German settlers grabbed land, cattle and other means of subsistence from the locals, triggering a Herero revolt on January 12, 1904 in which they killed 123 German civilians.
In the bloody Battle of Waterberg in August 1904, around 80,000 Herero fled with women and children toward Botswana. German troops went after them across what is now known as the Kalahari Desert. Only 15,000 Herero survived.
In October 1904, colonial military commander General Lothar von Trotha ordered that the Herero be exterminated.
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