حبیب السیر 18: Sultan Muhammad.

18

When the hand of Yaminu-d daula Mahmud was cut off from possession in worldly things, his son Muhammad, according to the will of his father, placed upon his head the crown of Sultanship, and, just as it was in the days of Mahmud, he appointed Hasnak Mikal prime minister. Sultan Mas'ud, who was at Hamadan, having obtained intelligence of the death of his father, hastened towards Khurasan, and wrote a letter to his brother to the effect that he did not want the country which his father had given to his brother, but he insisted that his name should be recited first in the khutba. Muhammad, having returned a stern refusal, began to make preparations for war, but several of those who consulted the welfare of the government employed their exertions to bring about a reconciliation between the two brothers. They were unavailing, for Muhammad would not yield in the least. Having entrusted the advance guard of the army to Yusuf bin Subuktigin, he set out on the road, and on the 1st of the blessed month of Ramazan, in the year 421 H., he arrived at Naginabad, which was in truth Nakbatabad (i.e. the abode of calamity), at which place he remained during the whole of the fasting month. On the feast day, his cap happened to fall off his head without any cause, a circumstance which the people interpreted as a bad omen, for on the night of the 3rd of Shawwal, Amir 'Ali Kheshawand and Yusuf bin Subuktigin, having conspired together, raised the standard of enmity, and made advances to Mas'ud. Having surrounded the tent of Muhammad, they seized him and imprisoned him in the fort of Naginabad.
The chief men then went out to meet Mas'ud, and Amir Hasnak, who was at Naishapur, came to the Court of Mas'ud. When Mas'ud saw him, he ordered him to be hanged, because he had heard that Hasnak had one day said in the Court of Muhammad that before Mas'ud should become king it would be right to make War. When 'Ali Kheshawand and Yusuf Subuktigin arrived at Hirat declaring their fealty to Mas'ud, the former was imprisoned and the latter murdered. Mas'ud rapidly moved on to Ghaznin, having imprisoned Muhammad in the fort of Naginabad.
In contradiction to what has been above written, men have it that before the eye of the prosperity of Muhammad was made blind by the iron of oppression, he had reigned four years. After Mas'ud had obtained the kingdom, Muhammad was imprisoned for nine years. After the death of Mas'ud he again became king for one year, and in the year 434 H. he was murdered by the order of Maudud bin Mas'ud.