Some churches are called "cathedral", but they are not the seat of a bishop. This may be because the way the church is organised changed over time. This is the case for Our Lady of Sorrows Church, Poprad, in Slovakia, for example. In Slovak language, this church is called "cathedral". It is part of the Roman Catholic Diocese of Spiš. This diocese was re-organised several times. Currently, the cathedral of the diocese is St. Martin's Cathedral (Spišská Kapitula). Churches that formerly were a diocesan seat may be called concathedral, co-cathedral, or pro-cathedral.