Government leaders and politicians across the political spectrum paid tributes to Weizsaecker as "one of the most outstanding German politicians" of the post-World War II era.
He was also praised for his role as a driving force behind Germany's reconciliation with eastern Europe and for his efforts to gain international esteem for this country after the war.
Merkel spoke of von Weizsaecker as "one of the most important and highly respected personalities" of Germany.
He had done a "great service for our country" and his death "is a big loss for Germany," she said in a statement.
Merkel said his statement on Germany's surrender in the World War II was a "necessary and clear message for the nation." She also praised his contributions as the first president of a unified Germany.
President Joachim Gauck said this nation "has lost a great man and an excellent head of state."
He will be remembered above all as the first German president to speak openly about the country's guilt in the war and to describe the capitulation of Nazi Germany at the end of the war as a "liberation" from a brutal regime.
In a speech before the Bundestag, the lower house of parliament, on May 8, 1985 to mark the 40th anniversary of the end of WWII, Weizsaecker said the end of the war was a "liberation from the inhuman system of the National Socialist (Nazi) tyranny."
The victory over the German terror regime was a condition for a peaceful new beginning in Europe, said Steinmeier.
