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Muhammad or Mehmud Shah, generally called Muhammad bin Islam Shah is believed to have been born in Daylam. He was almost ten years old when his father arrived in Kahek in 798/1396. If this is a genuine tradition, it implies that he was born possibly in 788/1386, and was about 17 years old while assuming the Imamate. He mostly resided in Shahr-i Babak in Kirman.
The Iranian Ismailis began to revert to their former settlements in different villages. Most of them engaged in agriculture in Kohistan, Qain, Birjand, Nishapur, Khorasan, Sirjan, Jabal-i Bariz, Mahallat and Yazd.

Imam Muhammad bin Islam Shah, also known as Muhammad or Mehmud Shah, was probably born in Daylam. He was ten years old when his father arrived in Kahek in 798/1396. If this is a genuine tradition, it implies that he was born possibly in 788/1386, and was about 17 years old while assuming the Imamate. He mostly resided in Shahr-i Babak in Kirman. Imam Muhammad bin Islam Shah seems to have started communications from his headquarters to different Ismaili communities, and also accepted the gifts of the pilgrims.