Sufism spread throughout the Northwestern China in the early decades of the Qing dynasty (mid-17th century through early 18th century), helped by somewhat easier travel between China and the Middle East.[30] Among the Sufi orders found in China are the Kubrawiyya, Naqshbandiyya, and Qadiriyya.[31] The Naqshbandiyya spread to China via Yemen and Central Asia.[32][33] Most Islamic proselytization activity occurred within the Muslim community itself between different sects and was not directed at non-Muslims, proselytizers who sought to convert other Muslims included people like Qi Jingyi, Ma Mingxin, Ma Qixi, and Ma Laichi.[34] Some Sufi orders wear distinctive headgear, a six cornered hat can be found in China.[35][36] The most important Sufi orders (menhuan) included: