July 8

The siege of Zanján was still in progress when he, [the Grand Vizir] dispensing with an explicit order from his sovereign, and acting independently of his counsellors and fellow-ministers, dispatched his order to Prince Hamzih Mírzá… the governor of Ádhirbayján, instructing him to execute the Báb. Fearing lest the infliction of such condign punishment in the capital of the realm would set in motion forces he might be powerless to control, he ordered that his Captive be taken to Tabríz, and there be done to death. Confronted with a flat refusal by the indignant Prince to perform what he regarded as a flagitious crime, the Amír-Nizám commissioned his own brother, Mírzá Hasan Khán, to execute his orders. 
- Shoghi Effendi  (‘God Passes By’)