Two of the more famous converts included by Khulusi were the Irish peer Rowland Allanson-Winn, 5th Baron Headley (1855–1935) and the English baronet Sir 'Abdullah' Archibald Hamilton 5th and 3rd Baronet (1876–1939). The former became known by the adopted Muslim name Shaikh Rahmatullah al-Farooq. He converted to Islam in 1913 and went on to write several books on Islam, including A Western Awakening to Islam (1914) and Three Great Prophets of the World (1923).