During the first half of the 14th century there were Nestorian Christian communities in many cities in China, and the province of Katai and Ong probably had several suffragan dioceses. In 1253 William of Rubruck mentioned a Nestorian bishop in the town of 'Segin' (Xijing, modern Datong in Shanxi province). The tomb of a Nestorian bishop named Shlemun, who died in 1313, has recently been discovered at Quanzhou in Fujian province. Shlemun's epitaph described him as 'administrator of the Christians and Manicheans of Manzi (south China)'. Marco Polo had earlier reported the existence of a Manichean community in Fujian, at first thought to be Christian, and it is not surprising to find this small religious minority represented officially by a Christian bishop.