al-Ma'mun's Review of the Ahwaz Estates

al-Rashid had granted Ubayd Allah ibn al-Mahdi a land grant for sharecropping in al-Ahwaz. Later a doubt arose about it, and al-Ma'mun ordered it examined. ¹

Some people brought the matter before al-Ma'mun, and he ordered the land to be surveyed and inspected. ¹

What had no doubt attached to it was carried out, and what was in doubt was called "the doubtful". The source says that this name is known in al-Ahwaz. ¹

The data gives no date and no detailed place; it needs an additional source.