Sayyid Kastir Gul (1573-1653) also known as Sheikh Al-Mashaikh Sheikh Rahmakar alias Kaka Sahib, was an Islamic jurist and Sufi saint of the 16th and 17th centuries who is still highly revered among Afghans and Pakistanis. He is the patriarch of the Pashtun Kakakhel tribe, which is distinguished from other Pashtun tribes by its descendants to the Prophet Muhammad.