Bahá'u'lláh was invited to remain in this home. [DB603]

The Sháh was informed of Bahá'u'lláh's arrival and sent an officer to the legation to demand the delivery of Bahá'u'lláh into his hands. The Russian minister, Prince Dolgorukov, refused and suggested that Bahá'u'lláh be sent to the home of the Grand Vizier. [BKG77; DB603]

Bahá'u'lláh was arrested. [BKG77; DB603]

On 28th June 1845, Prince Dolgorukov was appointed Russian ambassador to Tihrán. He was previously first secretary of the Russian legation at Istanbul. He arrived in Tihrán in January 1846.

 In Dec. 1852 Bahá'u'lláh was released from the Síyáh-Chál owing to the efforts of the Russian Minister Prince Dolgorukov. [GPB104–5]

See CH43–4 for the role of the Russian Consul in securing His release. He invoked his full power as an envoy of Russia and called out the Sháh and his court for their 'barbaric' behaviour.

The Russian minister invited Bahá'u'lláh to go to Russia but Bahá'u'lláh chose instead to go to Iraq.

http://bahaism.blogspot.com/