the attempt to take Bust, Khalaf and Sebuktigin seem to have been on good terms. Khalaf is reported to have participated in a campaign together with Sebuktigin and the Farighunid amir of Guzgan to assist the Samanids in quelling a rebellion in Khurasan. When Sebuktigin died in 997, however, his two sons Mahmud and Ismail disputed over who should succeed him. Khalaf viewed this as an opportunity to gain territory from the Ghaznavids, and sent his fourth son Tahir to take Quhistan and Badghis in 998. Tahir was defeated in Baghdis by Mahmud's uncle Bughrachuq, although the latter was killed in the fighting. Mahmud had no intention of letting this assault go unpunished. He led his troops into Sistan in 1000 and trapped a surprised Khalaf, who was staying at a hill resort. Khalaf, lacking an army, had to pay an indemnity, put Mahmud's name before his own on his coins and place the Ghaznavid's name in the khutba. Khalaf's son Tahir is mentioned as having invaded Buyid Kerman in 1000, although he was ultimately unsuccessful in making any lasting gains. Soon afterwards he, like Amir before him, rebelled against Khalaf. The rebellion ended with Tahir's capture; he was imprisoned and died not long after, in 1002. With Tahir's death Khalaf was no longer left with any suitable heirs. Khalaf's reign had grown increasingly unpopular over the years; his unpopularity especially grew after Tahir's rebellion. After Tahir died, the commander of his army sent a message to Mahmud of Ghazna, stating that the people of Zarang wanted him to become the ruler of Sistan. Mahmud responded by sending an advance force to secure Sistan. Khalaf resisted, barricaded himself in Taq and withstood a siege by the Ghaznavid force, so Mahmud decided to come personally in November 1002. Mahmud's army was reinforced by the townspeople of Zarang, eager to see the Saffarid defeated. By December 1002 Khalaf was forced to surrender. He was sent to Farighunid Guzgan, where he lived until 1006 or 1007. Rumors that Khalaf was in contact with the Karakhanids, whom Mahmud was at war with at the time, resulted in him being transferred south to Gardez, where he died in 1009. Sistan remained under Ghaznavid rule until 1029, when the Nasrid dynasty gained control of the country. References Books Bosworth, C.E. The History of the Saffarids of Sistan and the Maliks of Nimruz (247/861 to 949/1542-3). Costa