حبیب السیر 20: Shihabu-d daula Maudud.

20

When Maudud, who was in Balkh, the tabernacle of the faithful, heard of the murder of his father Mas'ud, he hastened with his victorious troops towards the metropolis of Ghaznin, and Muhammad also marched up from the neighbourhood of the Sind in the same direction. A battle was fought between the uncle and nephew, but the gale of victory blew upon the banner of Maudud, and Muhammad with his children, and Noshtigin Balkhi who was at the head of the insurrection, became the captives of the powerful decree of fate, and were all put to death, with the exception of 'Abdu-r Rahim the son of Muhammad. The reason of his salvation was as follows:
During the time that Mas'ud was in prison, it happened one day that 'Abdu-r Rahman snatched Mas'ud's cap off his head in a very rude manner, upon which 'Abdu-r Rahim took it from him, and placed it back again on the head of his uncle, at the same time reproaching and abusing his brother. In short, having taken vengeance on his father's murderers, Maudud built a village and a caravanserai upon that spot where he had gained the victory, and called it Fathabad. He then hastened to Ghaznin and Kandahar, where he made firm the carpet of justice, and exalted the standard of his power by bringing into the kingdom of Ghaznin and Kandahar several of the cities of Hind; but even during the prosperous days of Maudud the empire of Khurasan remained just the same as before, in the possession of the Saljukians, whom he could never conquer. Maudud died, after he had reigned seven years, on the 20th of Rajab, 441 H. (1049-50 A.D.).