Some streams of Islam have a tradition of venerating the relics attributed to the prophet Muhammad. The most genuine relics are believed to be those housed in Istanbul's Topkapı Palace, in a section known as Hirkai Serif Odasi (Chamber of the Holy Mantle) at the start of the Twentieth century. While there is little doubt about the Standard and the Mantle, some of the other relics have been suggested to have belonged to the Companions of the Prophet, rather than Muhammad himself. The authenticity of these claims is debated.