On Thursday 9th July, Nikola Pašić, Prime Minister of Serbia and Minister for Foreign Affairs, wrote a letter sent to all the Serbian legations:
The Crown Prince Alexander is receiving threatening letters from Austria-Hungary nearly every day. Make use of this in course of conversation with your colleagues and journalists.
The Crown Prince Alexander is Alexander Karađorđević, then 25 years old, the second son and fourth child of Petar Karađorđević (the heir of the former prince of Serbia who had abdicated in 1858) and Princess Zorka of Montenegro.
Alexander’s older brother George had abdicated under strong pressure from Nikola Pašić and other Serbian ministers, who believed him to be unfit to be king.