Pope Pius IX

Shoghi Effendi's account, in *God Passes By*, of Bahá'u'lláh's most consequential undertaking of the Adrianople period (1863-1868) — the composition and transmission of the great Tablets to the rulers of His era, addressing each by name and summoning the world's governors to recognise the new Day of God.

In *The Revelation of Bahá'u'lláh* Adib Taherzadeh recounts the Tablet that Bahá'u'lláh, prisoner in the fortress of 'Akká, addressed in 1868 to Pope Pius IX in the Vatican. The Tablet proclaimed that the Father had come, summoned the Pope to recognise Him, and counselled him to renounce temporal authority in favour of the spiritual ministry of his calling.