He afterwards invited a party of Muhammadan traders, who made known to him the unity of God; whereupon he believed in the unity and became a Muslim. A similar missionary influence was doubtless exercised by the numerous communities of Muslim merchants who carried their religion with them into the infidel cities of Hindustan. Arab geographers of the tenth and twelfth centuries mention the names of many such cities, both on the coast and inland, where the Musalmans built their mosques, and were safe under the protection of the native princes, who even granted them the privilege of living under their own laws. [894] The Arab merchants at this time formed the medium of commercial communication between Sind and the neighbouring countries of India and the outside world. They brought the produce of China and Ceylon to the sea-ports of Sind and from there conveyed them by way of Multan to Turkistan and Khurāsān. [895] It would be strange if these traders, scattered about in the cities of the unbelievers, failed to exhibit the same proselytising zeal as we find in the Muhammadan trader elsewhere. To the influence of such trading communities was most probably due the conversion of the Sammas, who ruled over Sind from A.D. 1351 to 1521. While the reign of Nanda b. Bābiniyyah of this dynasty is specially mentioned as one of such “peace and security, that never was this prince called upon to ride forth to battle, and never did a foe take the field against him,” [896] it is at the same time described as being “remarkable for its justice and an increase of Islam.” This increase could thus only have been brought about by peaceful missionary methods. One of the most famous of these missionaries was the celebrated saint, Sayyid Yūsuf al-Dīn, a descendant of ʻAbd al-Qādir Jīlānī, who was bidden in a dream to leave Baghdād for India and convert its inhabitants to Islam. He came to Sind in 1422 and after labouring there for ten years, he succeeded in winning over to Islam 700 families of the Lohāna caste, who followed the example of two of their number, by name Sundarjī and Hansrāj; these men embraced Islam, after seeing some miracles performed by the saint, and on their conversion received the names of Adamjī and Tāj Muḥammad respectively. Under the leadership of the grandson of the former, these people afterwards migrated to Cutch, where their numbers were increased by converts from among the Cutch Lohānas. [897]