"spot that art situate on the shores of the two seas" [KA217]
Upon arrival He and His family were driven to the residence of Shamsi Big near the Sharif Mosque. They stayed here about one month. His companions were given accommodation elsewhere in the city. [BKG197, 204; GPB157–61, HDBFXXVIII]
See BKG197–204 for an account of Bahá'u'lláh's stay.
His arrival in Constantinople and stay of about 5 years marked the first time in history that a Manifestation of God had set foot in the European continent. [Message from the Universal House of Justice dated 2 June 1982 addressed To the Friends gathered at the International Conference in Dublin.]
Among the works Bahá'u'lláh revealed in Constantinople was Mathnaví-i-Mubárak. [RB2:29–54]
Because the Shamsi Big residence was too small Bahá'u'lláh and His family were moved to the house of Visi Pasha, situated near the mosque of Sultan Fatih Mehmet. They spend three months in this residence. [ALM21]