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By the year 750, Debal (modern Karachi) was second only to Basra; Sindhi sailors from the port city of Debal voyaged to Basra, Bushehr, Musqat, Aden, Kilwa, Zanzibar, Sofala, Malabar, Sri Lanka and Java (where Sindhi merchants were known as the Santri). During the Decline of the Abbasid Caliphate in 860s, the Habbari dynasty became semi-independent and was eliminated and Mansura was invaded by Sultan Mahmud Ghaznavi. Sindh then again became an easternmost client State of the Later Abbasid Caliphs ruled by the Soomro Dynasty until the Siege of Baghdad (1258). Mansura was the first capital of the Soomra Dynasty and the last of the Habbari dynasty. Muslim geographers, historians and travelers such as al-Masudi, Ibn Hawqal, Istakhri, Ahmed ibn Sahl al-Balkhi, al-Tabari, Baladhuri, Nizami, al-Biruni, Saadi Shirazi, Ibn Battutah and Katip Çelebi wrote about or visited the region, sometimes using the name "Sindh" for the entire area from the Arabian Sea to the Hindu Kush.