Baháʼu'lláh (, born Ḥusayn-ʻAlí; 12 November 1817 – 29 May 1892) was an Iranian religious leader who founded the Baháʼí Faith. He was born to an aristocratic family in Iran and was exiled due to his adherence to the messianic Bábism. In 1863, in Ottoman Iraq, he first announced his claim to a revelation from God. He spent the rest of his life in further imprisonment in the Ottoman Empire. His teachings revolved around the principles of unity and religious renewal, ranging from moral and spiritual progress to world governance.

Baháʼu'lláh was raised with no formal education but was well-read and devoutly religious. His family was considerably wealthy, and at the age of 22 he turned down a position in the government, instead managing family properties and donating time and money to charities. At the age of 27 he accepted the claim of the Báb and became one of the most outspoken supporters of the new religious movement which advocated, among other things, abrogation of Islamic law, which attracted heavy opposition. At the age of 33, during a governmental attempt to exterminate the movement, Baháʼu'lláh narrowly escaped death, his properties were confiscated, and he was banished from Iran. Just before leaving, while imprisoned in the Síyáh-Chál dungeon, Baháʼu'lláh claimed to receive revelations from God marking the beginning of his divine mission. After settling in Ottoman Iraq, Baháʼu'lláh again attracted the ire of Iranian authorities, and they requested that the Ottoman government move him farther away. He spent months in Constantinople where the authorities became hostile to his religious claims and put him under house arrest in Edirne for four years, followed by two years of harsh confinement in the prison-city of Acre. His restrictions were gradually eased until his final years were spent in relative freedom in the area surrounding Acre.

Baháʼu'lláh wrote at least 1,500 letters, some book-length, that have been translated into at least 802 languages. Some notable examples include the Hidden Words, the Kitáb-i-Íqán, and the Kitáb-i-Aqdas. Some teachings are mystical and address the nature of God and the progress of the soul, while others address the needs of society, religious obligations of his followers, or the structure of Bahá’í institutions that would propagate the religion. He viewed humans as fundamentally spiritual beings and called upon individuals to develop divine virtues and further the material and spiritual advancement of society.

Baháʼu'lláh died in 1892 near Acre. His burial place is a destination for pilgrimage by his followers, known as Bahá’ís, who now reside in 236 countries and territories and number between 5 and 8 million. Baháʼís regard Baháʼu'lláh as a Manifestation of God in succession to others like Buddha, Jesus, or Muhammad.

Name, title, and photographs Baháʼu'lláh's given name was Ḥusayn-ʻAlí, and as the son of a nobleman in the province of Núr, he was known as Mírzá Ḥusayn-ʻAlí Núrí (Persian: ). In 1848 he took the title Baháʼ (بهاء), Arabic for "glory" or "splendour", or Baháʼu'lláh (, ), as a glorification of God.

Many symbols and phrases of the Baháʼí Faith derive their significance from the word Baháʼ. For example, a nine-pointed star or nine-sided temples are references to the numerical value of Baháʼ according to a system of numerology (b=2, h=5, á=1, ʼ=1); the word Baháʼí indicates a follower of Baháʼ, and his son ʻAbdu'l-Bahá (Servant of Baháʼ) chose his title to demonstrate servitude toward Baháʼu'lláh.

In the 1930s, Baháʼís adopted a standardized system of transliterating Arabic that renders Arabic faithfully into Roman script. The vowels without diacritical marks are short, and those with diacritical marks are long. His name is pronounced in four syllables: Ba, as in bat; há, as in hard; the apostrophe-like mark after "Bahá" is for the Arabic letter hamza which represents the glottal stop; u'l as in old (the apostrophe represents a contraction and is not pronounced); and láh as in law.

Common transliterations of the name, with or without diacritical marks, include Baha'u'llah, Bahaullah, and Baháʼ Alláh.

There are two known photographs of Baháʼu'lláh, both taken in Adrianople. Bahá’ís avoid displaying photographs or imagery of Baháʼu'lláh in public or in their homes, and prefer that others also avoid displaying them in books and websites. One picture is shown to Bahá’ís during visits to the International Archives building as part of an organized Bahá’í pilgrimage; it may also be displayed on certain other highly significant special occasions. The other image was reproduced by William Miller in his 1974 polemic against the Baháʼí Faith.

Early life in Iran

Baháʼu'lláh was born in Tehran, Iran, on 12 November 1817. Baháʼí authors trace his ancestry to Abraham through both his wives Keturah and Sarah, to the Zoroaster, to David's father Jesse, and to Yazdegerd III, the last king of the Sasanian Empire. His mother was Khadíjih Khánum, his father Mírzá ʻAbbás Núrí, known as Mírzá Buzurg, served as vizier to Imám-Virdi Mírzá, the twelfth son of Fath-Ali Shah Qajar.

Baháʼu'lláh married Ásíyih Khánum, the daughter of a nobleman, in Tehran in 1835 when he was 18 and she was 15. In his early twenties Baháʼu'lláh declined the life of privilege offered by his aristocratic lineage, instead devoting his time and resources to a range of charitable works that earned him renown as "the Father of the Poor".

Acknowledgment of the Báb

The Báb, a 24-year-old merchant from Shiraz, stirred Persia with his claim in May 1844, to not only be the promised redeemer of Islam (the Qa’im or Mahdi), but a new prophet of God similar to Moses, Jesus, and Muhammad. His original name was ʿAlí Muḥammad, and later assumed the title of the Báb (), indicating his position as a spiritual "gate to divine knowledge", and to a still greater God-sent educator whose imminent appearance he was preparing the way for.

Soon after declaring his spiritual mission to Mullá Husayn, the Báb sent him to Tehran to deliver a special tablet to one whom God would guide him to. After learning about Baháʼu'lláh through an acquaintance, Mullá Husayn felt compelled to arrange for Baháʼu'lláh to receive the tablet—this news brought great joy to the Báb when Mullá Husayn wrote him about it. Bahá’u’lláh received the tablet when he was 27, he immediately acknowledged the truth of the Báb's message and arose to share it with others. In his native province of Núr, Bahá’u’lláh's notability as a prominent local provided numerous opportunities to teach the Bábí Faith, and his trips attracted many to the new religion, including Muslim clerics. His Tehran home became a center for activities, and he generously gave financial support for the religion. In the summer of 1848, Bahá’u’lláh attended and hosted a gathering at Badasht in the province of Khorasan, where 84 Bábí disciples met for 22 days. At that conference historic discussions took place between those who wanted to maintain Islamic law (the religious heritage of most early Bábís) and those who believed the Báb had inaugurated a new religious dispensation. Baháʼu'lláh influenced agreement around the latter point of view. It was at Badasht that Mírzá Ḥusayn-ʻAlí Núrí assumed the name Bahá’ and also gave new spiritual names to all other attendees; thereafter the Báb addressed tablets to them by those names. When Táhirih, the most prominent female disciple of the Báb, was arrested after the conference, Baháʼu'lláh intervened to protect her. Subsequently, he himself was temporarily confined and punished with bastinado.

The Bábí Faith quickly spread across Persia, attracting large numbers of adherents. This provoked widespread opposition from both Islamic clerics fearful of losing congregants and associated benefits, and from civil authorities afraid of the growing influence of the Bábí community, resulting in thousands of Bábís being killed in relentless campaigns of persecution. In July 1850 the Báb himself was executed by firing squad in Tabriz at the age of 30.

In his teachings the Báb identifies himself as the first of two Manifestations of God whom the Creator was sending to usher in the enduring peace that is to signify humanity's attainment of maturity—when all people will live in unity as one human family. Baháʼís hold that the Báb's teachings lay the groundwork "for the eventual establishment of a society characterized by the unity of nations, fellowship of religions, equal rights of all people, and a compassionate, consultative, tolerant, democratic, moral world order". Woven throughout the Báb's teachings are references to "He whom God shall make manifest", the great Promised One for whom he was preparing the way. In numerous prophesies the Báb stated that the next divine educator would appear shortly after his own expected martyrdom. In one of his major works, the Báb stated: "Well is it with him who fixeth his gaze upon the Order of Baháʼu'lláh, and rendereth thanks unto his Lord."

Arrest and imprisonment Events leading up to and after the execution of the Báb were tumultuous for Bábís. As Muslim leaders incited fanatic mobs to violence against them, many Bábís—while refusing to take offensive steps against attackers—did take actions to defend themselves, but commonly ended-up being slaughtered. On 15 August 1852, two Bábí youth, in retaliation for the killings of the Báb and his leading disciples, made an attempt to assassinate the Iranian king. As Nasiri'd-Din Shah passed along a public road the two blocked the monarch to fire birdshot at him. The king escaped without serious injury, but the incident led to an outburst of persecution against Bábís far exceeding past events.

Though investigations found the offending pair acted alone, a "reign of terror" was unleashed, killing at least 10,000 Bábís that same year as government ministers vied with one another to collectively punish known or suspected Bábís, including Bahá’u’lláh. Well known for his support of the Bábí cause, Baháʼu'lláh was arrested and incarcerated in the subterranean Síyáh-Chál of Tehran, where he was bound in heavy chains that left life-long scars. Baháʼu'lláh was confined to that dungeon for four months, as the mother of the Shah and authorities seeking to curry favor with the king sought ways to justify executing him.

Revelation Bahá’u’lláh relates that during imprisonment in the Síyáh-Chál he had several mystical experiences, in which he received his mission as a manifestation of God, the Promised One heralded by the Báb. Bahá’ís view this dawning of Bahá’u'lláh's spiritual mission as the beginning of fulfillment of the Báb's prophecies regarding "Him whom God shall make manifest". The "inseparable" nature and unity of the twin revelations of the Báb and Bahá’u’lláh are why Bahá’ís consider both faiths as forming one complete religious entity, and the reason the 1844 declaration of the Báb is considered the starting date of the Bahá’í Faith.

Banishment from Persia

When it was proven beyond any doubt that Baháʼu'lláh was innocent of involvement with the attempt against the Shah's life, the Shah finally agreed to free him but decreed that Baháʼu'lláh would be permanently banished from Persia. Dispossessed of his extensive properties and wealth, in the exceptionally severe winter of January 1853 Baháʼu'lláh with family members undertook a three-month journey to Baghdad, thus beginning what became exile for the rest of his life in territories of the Ottoman Empire.

Life in exile

Baghdad