And finally, during a revolt in Balkh in Spring of 1449 by a certain Miranshah, which was crushed by Abdal-Latif Mirza, was discovered a letter from Ulugh Beg to this Miranshah ordering him to instigate the revolt. This story is not corroborated by any other source than Mirkhond but is given as a last excuse for all out war with his father. The real reason of this revolt may never be fully understood but Abdal-Latif Mirza marched in haste towards Samarkand after abolishing the state taxes on trade through Balkh and taking over the river boats on Amu Darya.