Bahá’u’lláh had requested a ten-minute meeting with the Sultan of the Ottoman Empire

And moreover, in the Lawḥ-i-Ra’ís, Bahá’u’lláh, recalling His conversation with the Turkish officer charged with the task of enforcing His banishment to the fortress-town of Akká, has written: “There is a matter, which, if thou findest it possible, I request thee to submit to His Majesty the Sulṭán, that for ten minutes this Youth be enabled to meet him, so that he may demand whatsoever he deemeth as a sufficient testimony and regardeth as proof of the veracity of Him Who is the Truth. Should God enable Him to produce it, let him, then, release these wronged ones, and leave them to themselves.” “He promised,” Bahá’u’lláh adds in that Tablet, “to transmit this message, and to give Us his reply. We received, however, no news from him. Although it becometh not Him Who is the Truth to present Himself before any person, inasmuch as all have been created to obey Him, yet in view of the condition of these little children and the large number of women so far removed from their friends and countries, We have acquiesced in this matter. In spite of this nothing hath resulted. Umar himself is alive and accessible. Inquire from him, that the truth may be made known unto you.” 

- Shoghi Effendi  (‘The Promised Day Is Come’)

Bahá’u’lláh expressed His readiness to have a “face to face” meeting “with the divines of the age” in the presence of the Sháh of Persia

In the Laeh-i-Sultán (Tablet to the Sháh of Persia) Bahá’u’lláh declares: “Would that the world-adorning wish of His Majesty might decree that this Servant be brought face to face with the divines of the age, and produce proofs and testimonies in the presence of His Majesty the Sháh! This Servant is ready, and taketh hope in God, that such a gathering may be convened in order that the truth of the matter may be made clear and manifest before His Majesty the Sháh. It is then for thee to command, and I stand ready before the throne of thy sovereignty. Decide, then, for Me or against Me.” 

- Shoghi Effendi  (‘The Promised Day Is Come’)

The “diversity of the subjects touched upon in these Tablets” of Báhá’u’lláh to “the emperors of the West and the potentates of the East”

No less amazing is the diversity of the subjects touched upon in these Tablets.

• The transcendent majesty and unity of an unknowable and unapproachable God is extolled, and the oneness of His Messengers proclaimed and emphasized.
• The uniqueness, the universality and potentialities of the Bahá’í Faith are stressed, and the purpose and character of the Bábí Revelation unfolded.
• The significance of Bahá’u’lláh’s sufferings and banishments is disclosed, and the tribulations rained down upon His Herald and upon His Namesake recognized and lamented.
• His own yearning for the crown of martyrdom, which they both so mysteriously won, is voiced, and the ineffable glories and wonders in store for His own Dispensation foreshadowed.
• Episodes, at once moving and marvelous, at various stages of His ministry, are recounted, and the transitoriness of worldly pomp, fame, riches, and sovereignty, repeatedly and categorically asserted.
• Appeals for the application of the highest principles in human and international relations are forcibly and insistently made, and the abandonment of discreditable practices and conventions, detrimental to the happiness, the growth, the prosperity and the unity of the human race, enjoined.
• Kings are censured, ecclesiastical dignitaries arraigned, ministers and plenipotentiaries condemned, and the identification of His advent with the coming of the Father Himself unequivocally admitted and repeatedly announced.
• The violent downfall of a few of these kings and emperors is prophesied, two of them are definitely challenged, most are warned, all are appealed to and exhorted. 

- Shoghi Effendi  (‘The Promised Day Is Come’)