Dr Mirza Muhammad-Mihdi Khan visited Baha'u'llah and his sons and followers at ‘Akka, and Subh-i-Azal at Famagusta in Cyprus

This is how Browne evaluates the work of Dr Mirza Muhammad-Mihdi Khan (the Persian journalist, the Za‘imu’d-Dawlih. He was the author of Miftahu Babi’l Abwab, or the Key to the Gate of Gates, a purported history of the Babi and Baha’i Faiths):

The author, though a determined antagonist of the Babis, writes with some appearance of moderation. Though often inaccurate, he adds fresh materials derived orally from his father Muhammad Taqi, who saw the Bab at Tabriz, and from other eyewitnesses, He also visited Baha'u'llah and his sons and followers at ‘Akka, and Subh-i-Azal at Famagusta in Cyprus, and made a collection of Babi and Baha'i books, from which he quotes lengthy extracts in this work, and which he subsequently deposited in the library of the Mosque and University of al-Azhar in Cairo. (Browne, Materials for the Study of the Babi Religion, p. 191.)

(Edward Granville Browne and the Baha'i Faith, by H. M. Balyuzi)