Kitáb-i-Aqdas

O Emperor of Austria! He Who is the Dayspring of God's Light dwelt in the prison of Akká at the time when thou didst set forth to visit the Aqsá Mosque.   ¶85

Francis Joseph (Franz Josef, 1830-1916), Emperor of Austria and King of Hungary, made a pilgrimage to Jerusalem in 1869. While in the Holy Land he failed to take the opportunity to inquire about Bahá'u'lláh Who at that time was a prisoner in Akká (Acre).

The Aqsá Mosque, literally, the "Most Distant" Mosque, is referred to in the Qur'án, and has become identified with the Temple Mount in Jerusalem.