What is the Satr?
Al-Satr (السَّتر — the veil, the concealment) refers to periods in which the Imam is physically hidden — present in the world but not publicly accessible. The mumin may not know who or where the Imam is. The Imam does not hold court, does not meet the general public, and does not claim political authority openly. His existence is maintained in secrecy.
The concept of Satr is not unique to one period. In the Ismaili Tayyibi tradition, there have been two major Satr periods:
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The First Satr (approximately 148–261 AH / 765–875 CE): Between the 8th Imam, Muhammad ibn Ismail (AS), and the public emergence of the 13th/1st Fatimid Imam, al-Mahdi (AS).
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The Second Satr (524 AH / 1130 CE to the present): Following the disappearance of Imam al-Tayyib (AS), who is now in concealment. The Bohra community lives in this Second Satr today, with the Dai al-Mutlaq representing the hidden Imam.
This article covers the First Satr — the four concealed Imams between Muhammad ibn Ismail (AS) and al-Mahdi (AS).
Why Concealment Was Necessary
The 8th Imam, Sayyidna Muhammad ibn Ismail (AS), lived during the Abbasid Caliphate — the ruling dynasty that had overthrown the Umayyads in 132 AH / 750 CE. The Abbasids were deeply hostile to the descendants of the Prophet (SAW) and especially to the Ismaili line, whom they rightly recognized as a theological and political threat.
Multiple Imams and Alid figures had already been imprisoned, poisoned, or killed by the authorities. To survive and to preserve the chain of nass (divine appointment) until conditions permitted its public re-emergence, the Imams entered concealment. This was not weakness or abandonment of the community — it was protection of the most precious thing: the living chain of divine knowledge.
The concealed Imams did not disappear from the Dawat’s awareness. The inner circle of the Dawat — the Hujjaj (proofs) and senior figures — maintained knowledge of who the Imam was and transmitted his guidance through trusted channels.
The Four Concealed Imams
The 9th Imam: Sayyidna Ahmad al-Wafi (AS)
Ahmad ibn Muhammad (AS), known as Ahmad al-Wafi (the Faithful), was the son of the 8th Imam, Muhammad ibn Ismail (AS). He lived approximately from the mid-2nd century AH through the early 3rd century AH and lived his entire life in concealment. He transmitted the Imamate to his son.
The title al-Wafi — the Faithful, the Keeper of the Covenant — reflects his role in maintaining the covenant of the Dawat through the most dangerous years of Abbasid rule.
The 10th Imam: Sayyidna Muhammad al-Taqi (AS)
Muhammad ibn Ahmad (AS), known as al-Taqi (the God-fearing, the pious one), continued the line of concealment. He too was born into secrecy and lived his life guarding the chain of Imamate. His title al-Taqi reflects the quality of deep God-consciousness that sustained the concealed Imams through their isolation.
The 11th Imam: Sayyidna Husain al-Radi (AS)
Husain ibn Muhammad (AS), known as al-Radi (the Content/Pleased), continued in concealment. He is not to be confused with the 3rd Imam, Imam Husain ibn Ali (AS) — this is a different member of the family sharing a blessed name. His title al-Radi speaks to the inner state of contentment and acceptance that marks one who surrenders to divine will.
The 12th Imam: Sayyidna Ali al-Zaki (AS)
Ali ibn Husain (AS), known as al-Zaki (the Pure), was the last of the concealed Imams before the public emergence. His son would be the great al-Mahdi (AS) who would emerge to establish the Fatimid Caliphate and bring the Imamate back into the open after nearly a century and a half of concealment.
What Did the Satr Mean for the Community?
During the First Satr, the mumin community faced a profound test of faith:
They could not see their Imam. They did not know his face, his location, or in many cases, his name. They received guidance through intermediaries — the Hujjaj, the dai, the trusted messengers of the Dawat.
This is the theological principle of Satr: the Imam’s presence is not diminished by his concealment. He exists. The chain of nass is unbroken. The light is there — simply behind a veil, for the protection of the lamp until the storm passes.
The hadith of the Prophet (SAW) — “Whoever dies without knowing the Imam of his time dies the death of ignorance” — does not require meeting the Imam face-to-face. It requires recognition: knowing that the Imam exists, acknowledging his authority, and connecting to the Dawat through his designated representatives.
During the First Satr, the mumin maintained this recognition through the Dawat’s inner structure. They gave their walayat to the Imam they could not see, and received guidance through those the Imam trusted.
The Emergence — Al-Mahdi Breaks the Satr
After approximately 113 years of concealment across four Imams, the 12th Imam, Sayyidna Ali al-Zaki (AS), died and was succeeded by his son: Sayyidna Muhammad al-Mahdi billah (AS) — the 13th Imam in the Ismaili Tayyibi count, and the 1st Imam of the Fatimid Caliphate.
In 297 AH / 909 CE, al-Mahdi (AS) emerged publicly in Raqqada, North Africa (modern Tunisia). The North African Kutama Berber movement, converted and organized over years by Ismaili dai Abu Abdullah al-Shi’i, had prepared the political and military ground. The concealed Imam’s emergence was not sudden — it was the fruit of decades of careful dawat work under his guidance.
Al-Mahdi (AS) declared himself publicly, established the Fatimid Caliphate — the only caliphate in Islamic history to be ruled by an Imam of the Prophet’s household in the Ismaili line — and broke the First Satr.
The Fatimid Caliphate would go on to rule Egypt, North Africa, and at its height much of the Islamic world for two centuries, establishing al-Azhar mosque and university in Cairo.
Lessons of the Satr for Today
The Bohra community today lives in the Second Satr — since the disappearance of Imam al-Tayyib (AS) in 524 AH / 1130 CE. The principle is the same: the Imam exists, the chain of nass is unbroken, and the Dai al-Mutlaq represents him in the world.
The First Satr teaches that:
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Concealment is not abandonment. The Imam in satr does not abandon his community. His guidance continues through the Dawat’s structure.
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The chain of nass can survive hostility. Four generations of concealed Imams maintained the chain through the worst years of Abbasid persecution. The nass was not broken.
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The end of Satr comes when conditions are right. The emergence of al-Mahdi (AS) shows that Satr is not permanent. The Second Satr will end — the Imam al-Tayyib (AS) will emerge when Allah wills, and that emergence will be as decisive and transformative as the emergence of al-Mahdi (AS) in 909 CE.
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Walayat through the Dai connects to the hidden Imam. Just as the Satr-period mumin maintained walayat through intermediaries, the Bohra mumin today connects to the Imam through the Dai al-Mutlaq. The walayat is real even if the Imam is unseen.
اللَّهُمَّ عَجِّل فَرَجَ صَاحِبِ الزَّمَان وَاجعَلنَا مِن أَعوَانِهِ وَأَنصَارِهِ O Allah, hasten the emergence of the Sahib al-Zaman (the Lord of the Age), and make us among his helpers and supporters.